What is the asthenosphere?
A) A portion of the atmosphere that blocks UV radiation
B) A soft, low-velocity layer in the upper mantle
C) The transition zone between the mantle and the outer core
D) The portion of the hydrologic cycle that describes how plants contribute their respiration
Answer: B
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This is the most fundamental reason why Earth currently has an atmosphere
A) strong winds keep the atmosphere moving horizontally above the Earth. B) the Earth's magnetic field prevents gas molecules from escaping into space. C) the Earth's gravity is strong enough to prevent most gases from escaping into space. D) Earth's atmosphere is quite dense, and thus very viscous. E) the solar wind constantly adds gas particles to the atmosphere.
Ice and snow on mountains absorbs sunlight, helping to store heat and moderate the climate.
Answer the following statement true (T) or false (F)
Which kind of magma has the lowest viscosity?
A. Basalt B. Andesite C. Granite D. Rhyolite
Which of the following factors decreases the body's ability to eliminate excess heat through evaporation?
A) High humidity B) Wet clothing C) Low wind chill D) Hyperventilation