The mass extinction at the end of the Ordovician wiped out about half of the ____ population
A)dinosaur
B)vascular plant
C)non-vascular plant
D)brachiopod and bryozoan
E)stromatoporoid and rugose coral
D
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Which is the effect of lower prices for a mineral commodity?
A. It encourages less waste of the resource. B. It spurs exploration for new deposits. C. It convinces buyers to use less. D. It encourages exploitation of lower grade deposits.
Locate and identify by name a prominent esker on the map:
A sinuously curving, narrow ridge of coarse sand and gravel is called an esker. Eskers form along the channel of a meltwater stream that flows beneath a glacier, in an ice tunnel, or between ice walls beneath the glacier. As a glacier retreats, the steep-sided esker is left behind in a pattern roughly parallel to the path of the glacier.
The Appalachian Mountains are ____
a. tilted fault blocks b. shield volcanoes c. folded d. horsts
Economic activities which emphasize harvesting or extracting materials from the ground or sea would be placed in which sector of the economy?
A. primary B. secondary C. tertiary D. quaternary E. quinary