What 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
ANSWER: a
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What tectonic setting is interpreted to be the cause of volcanism at Yellowstone?
A) Subduction along the coast of the Pacific Northwest B) Magma that is coming up along a bend in a transform fault C) Movement of North America over a mantle plume D) A large meteorite impact that struck the area 100 years ago
Critical distance is the same constant for everybody when it comes to defining activity space.
Answer the following statement true (T) or false (F)
Three world regions that are experiencing net emigration are: - __________, ___________, and ____________
Fill in the blank(s) with the appropriate word(s).
What type of desert can desert varnish, a shiny coating of iron and manganese oxides, most commonly be found?
A. erg B. reg C. seif D. hamada E. basin