What is the source of the energy that powers the Earth system?
A) the Sun
B) heat from Earth's interior
C) both A and B
D) none of the above
Ans: C) both A and B
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What are the two most abundant elements in Earth’s crust?
a. oxygen and aluminum. b. quartz and feldspar. c. silicates and carbonates d. silicon and oxygen.
Orogenies are characterized by metamorphism, igneous intrusions, and suture zones. Indicate whether the statement is true or false
What is diffusion?
a. The rate at which solute molecules present in a solution is equal to the rate they are being dissolved b. The reforming of crystals c. The amount of substances tied to biological cycles d. The random movement of materials through a solution
The prime factors in desertification in the Sahel were a natural drought and ________
A) an increase in forest cover B) overgrazing C) fence building D) tribal wars E) deposition of desert sand