Which impact is thought to be responsible for the extinction of the dinosaurs?
A. Chicxulub
B. Chelyabinsk
C. Meteor Crater
D. Tunguska
Answer: A
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Although many areas of the continental shelves are relatively featureless, there are some locations on the shelves that have received extensive glacial deposits and significant dissection by streams. How would this have been possible?
A) Glaciers and streams were powerful enough to shape the shelf underwater. B) The shelves were once above sea level but have since dropped below sea level due to tectonic activity. C) The sea level dropped during the last glacial episode because water was stored in large ice sheets, exposing the shelves. D) As the continents collided in the past, the shelves were lifted above sea level and became exposed to the elements.
Approximately, what percentage of Earth's freshwater is frozen?
A) 10% B) 25% C) 50% D) 75%
Students do not need to be concerned with environmental geology problems because they are all global
in scale. Indicate whether the statement is true or false.
True or False: Mantle convection occurs because upward-moving rock expands more by decompression than it contracts by cooling
Indicate whether this statement is true or false.