A hiatus between igneous or metamorphic rocks and sedimentary rocks is represented in the rock record by a(n) ____
A)angular unconformity
B)hiatal unconformity
C)nonconformity
D)anticonformity
E)disconformity
C
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Tropical forests are important sources of biodiversity because
A. they are exclusively in warm climates. B. they are located in the Southern Hemisphere. C. their proximity to urban populations. D. their competition with deserts, which are also biodiversity hotspots. E. at least half of the known terrestrial species of terrestrial plants, animals, and insects live in tropical forests.
The United Nations currently recognizes over 65 nearly "pure" nation-states
Indicate whether this statement is true or false
Step topography and mesas are created by what physical process?
A) Aeolian processes B) Rill erosion C) Differential erosion D) Glacial processes
At a mid-ocean ridge spreading center, what happens?
a. the plates are moving past each other b. the plates are moving away from each other c. the plates are moving toward each other d. one plate is being subducted beneath another e. both plates are being subducted