During the earliest history of the earth, ________
A) the earth was cold and lacked any source of heat.
B) the earth did not have any radioactive material
C) the temperature increased so that iron and nickel melted
D) almost all of the material was radioactive, and it decayed to the compositions we have today.
C
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In a well is an aquifer. What is the highest level water can rise to if there is no pump?
A. to the top of the well B. to the level of the water table C. just below the level of the water table D. It depends how deep the well is.
The boreal forest biome is known for its
A) coniferous trees. B) cacti trees. C) high biodiversity. D) tundra vegetation.
What is the change in composition and texture of a rock that occurs as a result of increases in temperature and pressure?
A. lithification B. weathering C. crystallization D. metamorphism
Deserts typically are centered around 30°N or 30°S because of ________.
A. predominant low-pressure systems B. the ITCZ C. predominant high-pressure systems D. the trade winds E. the Doldrums