What are shatter cones?
a. funnel-shaped cones of rock with apex pointing downward, with striations radiating downward and outward
b. funnel-shaped cones of rock with apex pointing upward, with striations radiating downward and outward
c. cone-shaped depressions in and around the crater, caused by hypervelocity impact
d. vertical cracks in rocks, radiating outward from the point of impact
e. rocks that shattered at impact, leaving cone-shaped depressions where the rocks once were
Question 2The impact of a large asteroid on Earth will NOT typically result in ____.
a. acid rain
b. tsunami, if the impact occurred in the ocean
c. iridium anomaly
d. melted rock and tiny, hollow spherules
e. high radioactivity in the crater
Question 3How fast do asteroids travel in space?
a. about 2 to 4 km per minute
b. about 15 to 40 km per minute
c. about 2 to 4 km per second
d. about 15 to 25 km per second
e. about 150 to 400 km per second
Question 4How many mass extinctions do scientists believe have occurred on Earth?
a. one
b. two
c. three
d. four
e. five
Question 5How fast do comets travel?
a. about 2 to 3 km per minute
b. about 60 km per minute
c. about 2 to 3 km per second
d. about 60 km per second
e. about 500 km per second
Question 6How is the tail of a comet oriented? (Which way does it point?)
a. It points away from the sun.
b. It points toward the sun due to gravitational attraction.
c. It points back from the direction of travel.
d. It points in the direction of its afterburner.
e. It oriented randomly in space.
Question 7What is the average diameter of the head of a comet?
a. 1-2 km
b. less than 15 km
c. 50 km
d. 500 km
e. 2,500 km
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