Geography and Earth Sciences

The opening and closing of an ocean basin is also referred to as a(n) ____________________. Fill in ...

The opening and closing of an ocean basin is also referred to as a(n) ____________________. Fill in ...

The opening and closing of an ocean basin is also referred to as a(n) ____________________. Fill in the blank(s) with the appropriate word(s).

sunil1285   38   1 Reply

mikeman2332

Eukaryotic cells likely originated from the ____________________ of prokaryotic cells. Fill in the ...

Eukaryotic cells likely originated from the ____________________ of prokaryotic cells. Fill in the ...

Eukaryotic cells likely originated from the ____________________ of prokaryotic cells. Fill in the blank(s) with the appropriate word(s).

yxc47   67   1 Reply

Hadajahpope

____________________ ____________________ ____________________ are alternating layers of chert and ...

____________________ ____________________ ____________________ are alternating layers of chert and ...

____________________ ____________________ ____________________ are alternating layers of chert and iron
  oxide minerals that formed in shallow marine environments 2.3-2.5 bya. Fill in the blank(s) with the appropriate word(s).

jaypatel432   74   1 Reply

Hadajahpope

Neoproterozoic glacial deposits are found on all continents except ____________________. Fill in the ...

Neoproterozoic glacial deposits are found on all continents except ____________________. Fill in the ...

Neoproterozoic glacial deposits are found on all continents except ____________________. Fill in the blank(s) with the appropriate word(s).

Kimstudies   51   1 Reply

Princessklo

The ____________________ ____________________ hypothesis states that widespread glaciers covered ...

The ____________________ ____________________ hypothesis states that widespread glaciers covered ...

The ____________________ ____________________ hypothesis states that widespread glaciers covered Earth and
  froze the seas during the Proterozoic. Fill in the blank(s) with the appropriate word(s).

gi.x3   29   1 Reply

tim87101010

____________________ are deposits that geologists use to indicate glaciation has occurred, but these ...

____________________ are deposits that geologists use to indicate glaciation has occurred, but these ...

____________________ are deposits that geologists use to indicate glaciation has occurred, but these conglomerates
  resemble other conglomerates that could have originated from other processes. Fill in the blank(s) with the appropriate

nurse12   27   1 Reply

leg17

The ____________________ represented the final stage in the Proterozoic continental accretion of ...

The ____________________ represented the final stage in the Proterozoic continental accretion of ...

The ____________________ represented the final stage in the Proterozoic continental accretion of Laurentia. Fill in the blank(s) with the appropriate word(s).

apich   33   1 Reply

jazzyn

The ____________________ orogen is the earliest mountain-building event that documents a complete ...

The ____________________ orogen is the earliest mountain-building event that documents a complete ...

The ____________________ orogen is the earliest mountain-building event that documents a complete
  ____________________ cycle of opening and closing ocean basins. Fill in the blank(s) with the appropriate word(s).

gi.x3   31   1 Reply

yuenc

When did the present style of plate tectonics develop?

When did the present style of plate tectonics develop?

When did the present style of plate tectonics develop?
  a. Archean
  b. Proterozoic
  c. Paleozoic
  d. Mesozoic
  e. Cenozoic

neonfayt   51   1 Reply

mikeman2332

After the fragmentation of Rodinia, it reassembled to form another supercontinent, ____.

After the fragmentation of Rodinia, it reassembled to form another supercontinent, ____.

After the fragmentation of Rodinia, it reassembled to form another supercontinent, ____.
  a. Nuna
  b. Kenorland
  c. Vaalbara
  d. Laurentia
  e. Pannotia

bgzhoumi   51   1 Reply

srw23557

Which rock types are found along passive continental margins?

Which rock types are found along passive continental margins?

Which rock types are found along passive continental margins?
  a. sandstone and granite
  b. limestone and granite
  c. sandstone, shale, and limestone
  d. komatiites and ophiolites
  e. ophiolit

bgzhoumi   43   1 Reply

chicken

Ediacaran faunal fossils are rare because they ____.

Ediacaran faunal fossils are rare because they ____.

Ediacaran faunal fossils are rare because they ____.
  a. existed for a short time
  b. lived in a narrow geographic range
  c. were soft-bodied animals
  d. are the oldest animal fossils
  e. were

SapphireSmoke   94   1 Reply

chicken

What happened to the carbon dioxide in Earths early atmosphere?

What happened to the carbon dioxide in Earths early atmosphere?

What happened to the carbon dioxide in Earths early atmosphere?
  a. It escaped to space.
  b. It remains in the atmosphere today.
  c. It moved to the stratosphere.
  d. It was incorporated into rocks and m

thebeagle96   53   1 Reply

tkelems2012

At the beginning of the Proterozoic, Earths atmosphere was mostly ____.

At the beginning of the Proterozoic, Earths atmosphere was mostly ____.

At the beginning of the Proterozoic, Earths atmosphere was mostly ____.
  a. oxygen
  b. nitrogen
  c. carbon dioxide
  d. water vapor
  e. argon

riveraes   60   1 Reply

tkelems2012

The boundary between the Archean and Proterozoic is marked by changes in ____.

The boundary between the Archean and Proterozoic is marked by changes in ____.

The boundary between the Archean and Proterozoic is marked by changes in ____.
  a. fossil assemblages
  b. crustal evolution styles
  c. atmospheric composition
  d. oceanic composition
  e. atmos

lindseyb1220   70   1 Reply

selica

Which modern day animal has ancestors represented in the Ediacaran fauna?

Which modern day animal has ancestors represented in the Ediacaran fauna?

Which modern day animal has ancestors represented in the Ediacaran fauna?
  a. frogs
  b. jellyfish
  c. trilobites
  d. snakes
  e. corals

merandaae19   43   1 Reply

saundrasmith243

What is one primary reason that there was so little diversification of life during the Archean and ...

What is one primary reason that there was so little diversification of life during the Archean and ...

What is one primary reason that there was so little diversification of life during the Archean and Paleoproterozoic?
  a. Prokaryotes reproduce asexually.
  b. Eukaryotes reproduce asexually.
  c. Prokaryotes and euka

apich   20   1 Reply

skalass

The increase in atmospheric oxygen during the Proterozoic was caused by ____.

The increase in atmospheric oxygen during the Proterozoic was caused by ____.

The increase in atmospheric oxygen during the Proterozoic was caused by ____.
  a. a decrease in worldwide volcanism.
  b. a decrease in the size of oceans.
  c. photosynthesis by cyanobacteria.
  d.

ben jeffs   29   1 Reply

tkelems2012

The three basic divisions of an ophiolite sequence are ____.

The three basic divisions of an ophiolite sequence are ____.

The three basic divisions of an ophiolite sequence are ____.
  a. upper mantle, lower continental crust, and sedimentary rocks
  b. oceanic crust, continental crust, and lower mantle
  c. upper mantle, upper continent

thebeagle96   33   1 Reply

Sauleha

Slices of ancient oceanic crust composed of mafic-ultramafic complexes, tectonically emplaced onto ...

Slices of ancient oceanic crust composed of mafic-ultramafic complexes, tectonically emplaced onto ...

Slices of ancient oceanic crust composed of mafic-ultramafic complexes, tectonically emplaced onto the continents,
  are called ____.
  a. turbidites
  b. ophiolites
  c. sandstone-carbonate-shale assemblage

Leikakei113   45   1 Reply

chicken

Ophiolites are found at ____ plate margins.

Ophiolites are found at ____ plate margins.

Ophiolites are found at ____ plate margins.
  a. divergent
  b. convergent
  c. transform
  d. passive
  e. rifted

Mroche   59   1 Reply

saundrasmith243

Evidence for free oxygen in the atmosphere comes from ____.

Evidence for free oxygen in the atmosphere comes from ____.

Evidence for free oxygen in the atmosphere comes from ____.
  a. zircon crystals
  b. sandstone-carbonate-shale assemblage
  c. multicelled organisms
  d. continental red beds
  e. tillites

Wutwut12   39   1 Reply

Netsirk

A conglomerate that is formed by glacial processes is called ____.

A conglomerate that is formed by glacial processes is called ____.

A conglomerate that is formed by glacial processes is called ____.
  a. glacial striation
  b. tillite
  c. erratic
  d. glacial duen
  e. snowball Earth

Mroche   33   1 Reply

Ashleyroshell

A landmass in the Precambrian made up of North America, Greenland, parts of northwestern Scotland, ...

A landmass in the Precambrian made up of North America, Greenland, parts of northwestern Scotland, ...

A landmass in the Precambrian made up of North America, Greenland, parts of northwestern Scotland, and perhaps
  some of the Baltic shield of Scandinavia was ____.
  a. Gondwana
  b. Laurentia
  c. Rodinia

bgzhoumi   47   1 Reply

yilongchang

Orogens are characterized by ____. (Multiple Choice)

Orogens are characterized by ____. (Multiple Choice)

Orogens are characterized by ____.
  a. rifting
  b. high oxygen levels
  c. igneous and metamorphic activity
  d. extensive glacial activity
  e. increased biological diversity

gi.x3   104   1 Reply

Helverson28

The process by which Rodinia broke apart was ____.

The process by which Rodinia broke apart was ____.

The process by which Rodinia broke apart was ____.
  a. accretion
  b. rifting
  c. underplating
  d. orogen
  e. abiogenesis

Mroche   85   1 Reply

Joisar

Rocks that were formerly part of Laurentia are now mostly in ____.

Rocks that were formerly part of Laurentia are now mostly in ____.

Rocks that were formerly part of Laurentia are now mostly in ____.
  a. North America
  b. South America
  c. Europe
  d. Africa
  e. Antarctica

jessiecraane   40   1 Reply

mikeman2332

Which biological process may have resulted in the development of eukaryotic organisms from primitive ...

Which biological process may have resulted in the development of eukaryotic organisms from primitive ...

Which biological process may have resulted in the development of eukaryotic organisms from primitive prokaryotic
  organisms?
  a. endosymbiosis
  b. abiogenesis
  c. stratification
  d. progradati

ibukunsulie85   38   1 Reply

Joisar

Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron ...

Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron ...

Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron oxides such as
  hematite and magnetite, are called ____.
  a. banded iron formations (BIFs)
  b. limestones
 

ggull329   73   1 Reply

mikeman2332

Asia is classified as a supercontinent because it contains more land area than any other continent. ...

Asia is classified as a supercontinent because it contains more land area than any other continent. ...

Asia is classified as a supercontinent because it contains more land area than any other continent.
  a. True
  b. False

Madam   22   1 Reply

meek2199

Humans cells are eukaryotes. (Multiple Choice)

Humans cells are eukaryotes. (Multiple Choice)

Humans cells are eukaryotes.
  a. True
  b. False

Zoeyismycat   19   1 Reply

busfuohrugf

The supercontinent Rodinia consisted of Laurentia and other smaller landmasses.

The supercontinent Rodinia consisted of Laurentia and other smaller landmasses.

The supercontinent Rodinia consisted of Laurentia and other smaller landmasses.
  a. True
  b. False

Leikakei113   57   1 Reply

skalass

Multicelled organisms first appeared in the fossil record about 4.0 billion years ago.

Multicelled organisms first appeared in the fossil record about 4.0 billion years ago.

Multicelled organisms first appeared in the fossil record about 4.0 billion years ago.
  a. True
  b. False

tamaraco   74   1 Reply

nino99

The transition from single to multicelled organisms may have started with the specialization of ...

The transition from single to multicelled organisms may have started with the specialization of ...

The transition from single to multicelled organisms may have started with the specialization of cells in colonies.
  a. True
  b. False

nurse12   35   1 Reply

joanneanna

The primary source for free oxygen introduced into the atmosphere during the Proterozoic was through ...

The primary source for free oxygen introduced into the atmosphere during the Proterozoic was through ...

The primary source for free oxygen introduced into the atmosphere during the Proterozoic was through
  photosynthesis.
  a. True
  b. False

merandaae19   45   1 Reply

scatherine

Both the presence of banded iron formations and red beds are evidence that the atmosphere and ...

Both the presence of banded iron formations and red beds are evidence that the atmosphere and ...

Both the presence of banded iron formations and red beds are evidence that the atmosphere and hydrosphere changed
  from oxidizing to reducing in the Proterozoic.
  a. True
  b. False

Wutwut12   34   1 Reply

busfuohrugf

Fortunately for life, oxygen levels in the atmosphere have been stable over Earths history.

Fortunately for life, oxygen levels in the atmosphere have been stable over Earths history.

Fortunately for life, oxygen levels in the atmosphere have been stable over Earths history.
  a. True
  b. False

anvaridthe   47   1 Reply

saundrasmith243

Orogens are belts of igneous and metamorphic rocks formed by the collisions of cratons.

Orogens are belts of igneous and metamorphic rocks formed by the collisions of cratons.

Orogens are belts of igneous and metamorphic rocks formed by the collisions of cratons.
  a. True
  b. False

Coco   45   1 Reply

lconard0726

The Grenville orogeny was the culminating event of the amalgamation of Laurentia.

The Grenville orogeny was the culminating event of the amalgamation of Laurentia.

The Grenville orogeny was the culminating event of the amalgamation of Laurentia.
  a. True
  b. False

emalay516   62   1 Reply

skalass

Sandstone-carbonate-shale assemblages are characteristic of the early continental rifting phase of ...

Sandstone-carbonate-shale assemblages are characteristic of the early continental rifting phase of ...

Sandstone-carbonate-shale assemblages are characteristic of the early continental rifting phase of the Wilson cycle.
  a. True
  b. False

Leikakei113   65   1 Reply

ebwilliams25