What are the two primary factors that control biologic productivity in the surface oceans?
a) Sunlight and temperature
b) Temperature and sunlight
c) Temperature and nutrients
d) Sunlight and nutrients
e) Sunlight and oxygen
D
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Any cud-chewing placental mammal with a complex three- or four-chambered stomach, such as
deer, cattle, antelope, or camels:a. marsupial d. reptile b. ammonoid e. hominid c. ruminant
Why did the Neptunists think that volcanoes were the product of locally burning coal seams?
A) They thought that coal was extremely abundant at that time. B) They had no other explanation; they believed in a cold primitive earth. C) They thought that plate tectonics would shake the coal, causing it to burn. D) They thought that impacts of comets or meteors heated the coal, making it burn.
Differential weathering is controlled by _____
a. the angle of repose for different particle sizes b. variations in oxygen availability c. differences in rainwater chemistry d. variation in climate e. differences in rock type
Warm air is less dense than cold air. Indicate whether the statement is true or false