Biofuels and nuclear power may prove useful as ________
A) pollution-free sustainable energies
B) stages in the development of fusion generators
C) inexpensive technologies for developing nations
D) energies to bridge the time between fossil fuel depletion and new renewables
E) replacement fuels for motor vehicles
D
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Deserts, tropical forests, prairie grasslands, and coniferous forests are all examples of
a. different species b. ecosystems with the highest biodiversity c. ecosystems with low genetic biodiversity d. Biomes e. Populations
What is the end product of carbon respiration?
a. Oxygen b. Nitrogen c. Ammonium d. Carbon dioxide e. Glucose
What is a fjord?
A) a flooded valley originally carved out by glaciers B) an intermontaine plateau formed by the erosion of two neighboring mountains into a shared valley C) a fan-shaped deposit of sediments dropped by a river or stream flowing out of a mountain range D) hilly topographic features that mark the path of glaciers; they are composed of eroded material carried by glaciers and ice sheets E) a fine, wind-deposited sediment that makes fertile soil, but is vulnerable to water erosion
A(n) ________ is a body of rock of considerable thickness that is large enough to be mappable and with characteristics that distinguish it from adjacent rocks.
A. epoch B. formation C. bed D. blanket E. layer