Which object has zero acceleration?
A. An object in mechanical equilibrium
B. An object moving at constant velocity
C. An object at rest
D. all of the above
Answer: D
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Discuss how Silurian and Devonian reefs differed from Cambrian reefs What will be an ideal response?
Why are diamonds so hard?
A) They are formed under very cold conditions. B) They are held together by strong metallic bonds. C) They are held together by strong ionic bonds. D) They are held together by strong covalent bonds.
The difference between the atmosphere's "permanent" gasses and "variable" gasses is that:
A) permanent gasses exchange rapidly between the atmosphere and the biosphere. B) variable gasses are so called because of their horizontal displacement. C) permanent gasses exhibit a constant proportion from the earth's surface to higher reaches of the atmosphere. D) variable gasses are dependent on storms for world-wide dispersion.
What term describes the straight scratches on rock surfaces created by glacial abrasion?
A)rock flour B)glacial striations C)glacial till D)varves E)moraines