Geography and Earth Sciences

Sandstone-carbonate-shale assemblages are characteristic of active margin sedimentation.

Sandstone-carbonate-shale assemblages are characteristic of active margin sedimentation.

Sandstone-carbonate-shale assemblages are characteristic of active margin sedimentation.
  a. True
  b. False

neonfayt   58   1 Reply

return127

Mineral diversity increased after the Great Oxygenation event.

Mineral diversity increased after the Great Oxygenation event.

Mineral diversity increased after the Great Oxygenation event.
  a. True
  b. False

meganchambers8   42   1 Reply

yilongchang

Passive margin deposits are rare or absent during the Proterozoic and thereafter.

Passive margin deposits are rare or absent during the Proterozoic and thereafter.

Passive margin deposits are rare or absent during the Proterozoic and thereafter.
  a. True
  b. False

tamaraco   44   1 Reply

srw23557

Most basement rock formed during the Archean and Proterozoic eons.

Most basement rock formed during the Archean and Proterozoic eons.

Most basement rock formed during the Archean and Proterozoic eons.
  a. True
  b. False

Mroche   39   1 Reply

meek2199

Glaciers were rare during the Proterozoic, as temperatures were too warm.

Glaciers were rare during the Proterozoic, as temperatures were too warm.

Glaciers were rare during the Proterozoic, as temperatures were too warm.
  a. True
  b. False

jessiecraane   24   1 Reply

busfuohrugf

The Ediacaran fauna of Australia is an example of preservation of some of the earliest known ...

The Ediacaran fauna of Australia is an example of preservation of some of the earliest known ...

The Ediacaran fauna of Australia is an example of preservation of some of the earliest known fossils.
  a. True
  b. False

Wutwut12   41   1 Reply

ecarvallo1

The Ediacaran fauna of Australia includes many examples of organisms with hard shells and internal ...

The Ediacaran fauna of Australia includes many examples of organisms with hard shells and internal ...

The Ediacaran fauna of Australia includes many examples of organisms with hard shells and internal body parts.
  a. True
  b. False

applegatedogs   41   1 Reply

tysonras

Continental red beds formed before banded iron formations.

Continental red beds formed before banded iron formations.

Continental red beds formed before banded iron formations.
  a. True
  b. False

Brapbrap   42   1 Reply

Joisar

During the Grenville orogeny, an ocean basin along the eastern margin of North America was closed. ...

During the Grenville orogeny, an ocean basin along the eastern margin of North America was closed. ...

During the Grenville orogeny, an ocean basin along the eastern margin of North America was closed.
  a. True
  b. False

merandaae19   54   1 Reply

srw23557

The Pacific Ocean is in the later phase of a Wilson Cycle.

The Pacific Ocean is in the later phase of a Wilson Cycle.

The Pacific Ocean is in the later phase of a Wilson Cycle.
  a. True
  b. False

luciaf99   40   1 Reply

premed9

Banded iron formations precipitated in oxygen-rich ocean waters.

Banded iron formations precipitated in oxygen-rich ocean waters.

Banded iron formations precipitated in oxygen-rich ocean waters.
  a. True
  b. False

keelyhawkins   37   1 Reply

Astalina

A eukaryotic cell has a well-defined nucleus and organelles, including mitochondria and plastids. ...

A eukaryotic cell has a well-defined nucleus and organelles, including mitochondria and plastids. ...

A eukaryotic cell has a well-defined nucleus and organelles, including mitochondria and plastids.
  a. True
  b. False

jkidane1829393   63   1 Reply

kellypooh97

Early in Earth history, the Sun was less luminous, which should have caused Earth to be much colder ...

Early in Earth history, the Sun was less luminous, which should have caused Earth to be much colder ...

Early in Earth history, the Sun was less luminous, which should have caused Earth to be much colder and all water to
  be frozen. Yet all evidence points to the presence of liquid water on Earth. Give two explanations that could resolve

jessiecraane   66   1 Reply

zxcvbn

What are two reasons that Earth lost its first atmosphere of hydrogen and helium? What will be an ...

What are two reasons that Earth lost its first atmosphere of hydrogen and helium? What will be an ...

What are two reasons that Earth lost its first atmosphere of hydrogen and helium? What will be an ideal response?

alexisangelique   43   1 Reply

Wilkinson

Explain why Mercury, Venus, and Mars lack plate tectonics.

Explain why Mercury, Venus, and Mars lack plate tectonics.

Explain why Mercury, Venus, and Mars lack plate tectonics. What will be an ideal response?

anvaridthe   58   1 Reply

ebwilliams25

Discuss the origin of early Earths hydrosphere

Discuss the origin of early Earths hydrosphere

Discuss the origin of early Earths hydrosphere What will be an ideal response?

ibukunsulie85   39   1 Reply

zxcvbn

Discuss the characteristics and formation of greenstone belts. Why are these rocks important in ...

Discuss the characteristics and formation of greenstone belts. Why are these rocks important in ...

Discuss the characteristics and formation of greenstone belts. Why are these rocks important in explaining early Earth
  history? What will be an ideal response?

sopmit   25   1 Reply

Avi cardinals

Discuss the origin of Earths earliest granitic crust. What processes were important in forming this ...

Discuss the origin of Earths earliest granitic crust. What processes were important in forming this ...

Discuss the origin of Earths earliest granitic crust. What processes were important in forming this crust?c What will be an ideal response?

joewalcott24   28   1 Reply

nino99

Describe and discuss the difference between a craton and a shield.

Describe and discuss the difference between a craton and a shield.

Describe and discuss the difference between a craton and a shield. What will be an ideal response?

Mroche   24   1 Reply

scatherine

Describe and discuss the early atmosphere of Earth. What was its most likely composition? How was it ...

Describe and discuss the early atmosphere of Earth. What was its most likely composition? How was it ...

Describe and discuss the early atmosphere of Earth. What was its most likely composition? How was it different from
  the present atmosphere and why? What will be an ideal response?

cristinaloayza   32   1 Reply

saundrasmith243

Collectively, the shield and platform of a continent are known as a(n) ____________________. Fill in ...

Collectively, the shield and platform of a continent are known as a(n) ____________________. Fill in ...

Collectively, the shield and platform of a continent are known as a(n) ____________________. Fill in the blank(s) with the appropriate word(s).

meganchambers8   57   1 Reply

selica

Geologists believe that ____________________ are the remains of reef structures from one of the ...

Geologists believe that ____________________ are the remains of reef structures from one of the ...

Geologists believe that ____________________ are the remains of reef structures from one of the first
  photosynthesizing organisms. Fill in the blank(s) with the appropriate word(s).

yxc47   39   1 Reply

Princessklo

During the process of ____________________, rising magma from a subducting plate or mantle plume ...

During the process of ____________________, rising magma from a subducting plate or mantle plume ...

During the process of ____________________, rising magma from a subducting plate or mantle plume accumulates
  beneath a continent. Fill in the blank(s) with the appropriate word(s).

gi.x3   81   1 Reply

skalass

Earths first atmosphere likely consisted of ____________________ and ____________________, the most ...

Earths first atmosphere likely consisted of ____________________ and ____________________, the most ...

Earths first atmosphere likely consisted of ____________________ and ____________________, the most abundant
  gasses in the universe. Fill in the blank(s) with the appropriate word(s).

jkidane1829393   25   1 Reply

selica

____________________ organisms rely on external sources of nutrients. (Fill in the blank)

____________________ organisms rely on external sources of nutrients. (Fill in the blank)

____________________ organisms rely on external sources of nutrients. Fill in the blank(s) with the appropriate word(s).

Mroche   38   1 Reply

chicken

____________________ organisms need no oxygen to survive. (Fill in the blank)

____________________ organisms need no oxygen to survive. (Fill in the blank)

____________________ organisms need no oxygen to survive. Fill in the blank(s) with the appropriate word(s).

nurse12   29   1 Reply

meek2199

Early atmospheric gases were emitted because of ____________________. (Fill in the blank)

Early atmospheric gases were emitted because of ____________________. (Fill in the blank)

Early atmospheric gases were emitted because of ____________________. Fill in the blank(s) with the appropriate word(s).

panda_buhr   32   1 Reply

DJF101814

The ____________________ forms the exposed part of the craton in North America. (Fill in the blank)

The ____________________ forms the exposed part of the craton in North America. (Fill in the blank)

The ____________________ forms the exposed part of the craton in North America. Fill in the blank(s) with the appropriate word(s).

potato55   53   1 Reply

saundrasmith243

Areas of buried shield rock with younger sedimentary cover are known as _______________ Fill in the ...

Areas of buried shield rock with younger sedimentary cover are known as _______________ Fill in the ...

Areas of buried shield rock with younger sedimentary cover are known as _______________ Fill in the blank(s) with the appropriate word(s).

lexilourdes   44   1 Reply

mikeman2332

What are two possible energy sources for the synthesis of organic molecules?

What are two possible energy sources for the synthesis of organic molecules?

What are two possible energy sources for the synthesis of organic molecules?
  a. UV radiation and magnetism
  b. radioactive decay and lightning
  c. radioactive decay and UV radiation
  d. lightning and UV

ibukunsulie85   50   1 Reply

Ashleyroshell

The earliest crust was probably ____.

The earliest crust was probably ____.

The earliest crust was probably ____.
  a. rich in precious metals
  b. composed of felsic igneous rock
  c. composed of ultramafic rock
  d. very similar to the one of today
  e. composed of basal

joewalcott24   38   1 Reply

leg17

Why does Earth have plate tectonics?

Why does Earth have plate tectonics?

Why does Earth have plate tectonics?
  a. denser oceanic crust (relative to continental crust)
  b. thicker oceanic crust (relative to continental crust)
  c. relatively rapid cooling
  d. convection current

Zoeyismycat   74   1 Reply

tim87101010

Why does Earth have water?

Why does Earth have water?

Why does Earth have water?
  a. photosynthesis
  b. large concentrations of sedimentary rocks
  c. torrential flooding in Earths early history
  d. enormous tidal forces in early Earth history
&n

thebeagle96   53   1 Reply

Ashleyroshell

What are the two tectonic models postulated for greenstone belt evolution?

What are the two tectonic models postulated for greenstone belt evolution?

What are the two tectonic models postulated for greenstone belt evolution?
  a. back-arc marginal basin and continent/continent collision
  b. continent/continent collision and intracontinental rift
  c. intracontinen

ggull329   46   1 Reply

busfuohrugf

What is one characteristic of Archean rocks?

What is one characteristic of Archean rocks?

What is one characteristic of Archean rocks?
  a. paleomagnetism
  b. numerous outcrops
  c. medicinal properties
  d. diverse fossil content
  e. earliest fossils of life on Earth

Coco   166   1 Reply

Astalina

Which event did not occur in the Hadean (4.6-4.0 bya)?

Which event did not occur in the Hadean (4.6-4.0 bya)?

Which event did not occur in the Hadean (4.6-4.0 bya)?
  a. formation of oceans
  b. extremely bright Sun
  c. formation of Moon
  d. accretion of Earth
  e. formation of core and mantle

riveraes   30   1 Reply

karlyphilpott

The nucleus or foundation of a continent is a(n) ____.

The nucleus or foundation of a continent is a(n) ____.

The nucleus or foundation of a continent is a(n) ____.
  a. stromatolite
  b. greenstone belt
  c. Permian province
  d. craton
  e. orogenic belt

Johnni   45   1 Reply

tysonras

The newly-formed Earths atmosphere was very different from Earths current atmosphere because it had ...

The newly-formed Earths atmosphere was very different from Earths current atmosphere because it had ...

The newly-formed Earths atmosphere was very different from Earths current atmosphere because it had ____.
  a. an abundance of mercury vapor
  b. an enormous amount of carbon dioxide, resulting in very hot temperatures due to g

ben jeffs   84   1 Reply

dalenambawan

What are the primitive organisms thought to have been responsible for the development of Earths ...

What are the primitive organisms thought to have been responsible for the development of Earths ...

What are the primitive organisms thought to have been responsible for the development of Earths oxygen-rich
  atmosphere in the Precambrian?
  a. tillites
  b. cyanobacteria (blue-green algae)
  c. foraminif

luciaf99   44   1 Reply

dkeysdanie

Hot mineral-rich seawater is ejected from ____.

Hot mineral-rich seawater is ejected from ____.

Hot mineral-rich seawater is ejected from ____.
  a. volcanic arc systems
  b. convergent boundaries
  c. submarine hydrothermal vents
  d. SPAHs (sulfur, phosphorus, and hydrogen) vents
  e

sunil1285   42   1 Reply

dkeysdanie