Prior to the Columbian Exchange, the only large domestic animals in the Americas used for work/protein were
A) dogs.
B) dogs and llamas.
C) dogs, llamas and horses.
D) dogs, llamas, horses, and oxen.
E) dogs, llamas, horses, oxen and pigs.
Answer: B
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Convection is a
A) mode of heat transfer that circulates heat within Earth's mantle. B) mode of heat transfer that carries heat from Earth's core toward its surface. C) form of insulation that maintains Earth's internal temperature. D) form of heat transfer restricted to Earth's interior.
Gross primary productivity (GPP) is the biomass produced by photosynthesis minus the rate at which biomass is used for aerobic respiration.
Answer the following statement true (T) or false (F)
A glacier that is experiencing net ablation is ____
a. retreating b. advancing c. in equilibrium d. thickening
What type of slope is most likely to experience a landslide?
A. features many trees and other plants and is steep B. is covered with grass, is of moderate steepness, and is wet C. features little vegetation and highly weathered rock, is steep, and is dry D. features little vegetation and highly weathered rock, is steep, and is wet