Clay minerals are sheet silicates with flat surfaces that are ________ charged and attract ________.
A. negatively; water molecules
B. neutrally; other clay minerals
C. negatively; nitrogen gas
D. positively; insects
E. positively; carbonic acid
Answer: A
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Describe the two primary forces that set ocean water in motion and how they drive both surface and thermohaline currents
Geographical features on the earth, such as mountain ranges, do not have much effect on the weather because the features are small compared to the thickness of the atmosphere
Indicate whether the statement is true or false
What causes magnetic stripes on the seafloor, such as those shown here?
A. Some volcanic rocks are formed in normal ways and others have pillows. B. Volcanic rocks in oceanic crust are covered by a variable thickness of sediment. C. Sometimes Earth's magnetic field points north and sometimes it points south. D. Some oceanic crust consists of volcanic rocks and some is composed of sediment.
The cycles of slow buildup and advance of glaciers followed by rapid shrinkage and retreat is caused by ________.
A. tilt of Earth's axis B. precession of the equinoxes C. eccentricity of Earth's orbit around the Sun D. All of these choices are correct. E. None of these choices are correct.