Which of the following describes the coastline of the Atlantic Periphery?
A) Gently sloping, with wide flat sandy beaches
B) Glaciation as left thin soils and rocky, rugged coastline
C) Many harbors where cities and towns have been established
D) Both A and C
E) Both B and C
E
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What statement most accurately describes the theory of seafloor spreading?
A)Subduction zones produce oceanic crust that moves away from these zones by seafloor spreading toward mid-oceanic ridges where it is consumed. B)Oceanic crust continuously forms across the seafloor and is moved by subduction zones toward mid-oceanic ridges where it is consumed. C)Oceanic crust continuously forms at mid-oceanic ridges, moves away from these ridges by seafloor spreading, and is consumed at subduction zones. D)Earth's molten core material erupts at mid-oceanic ridges, moves away from these ridges by seafloor spreading, and is consumed at subduction zones. E)Subduction zones force oceanic crust to spread across the seafloor before being consumed at a fault valley.
Acacias and elephants in southern Africa are indicative of which biome?
A) Midlatitude grassland B) Tropical savanna C) Desert D) Arctic and alpine tundra
In the United States, ________ is the leading source of energy
A) natural gas B) coal C) oil D) wood E) nuclear
A machine increases the potential energy of a heavy load by about 1000 J with a work input of 2000 J. The efficiency of the machine is about
A. 50%. B. 80%. C. 20%. D. 10%.