What is one reason diatomaceous earth is economically valued?
A) It can be used as a fossil fuel alternative.
B) It can be used for various filtration systems.
C) It can be broken up for gravel and used as building materials.
D) It demonstrates the presence of "marine snow."
C
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A mosquito flying at 2 m/s encounters a 2-m/s breeze blowing in the same direction, giving it a resulting speed over the ground of
A. 0 m/s. B. 4 m/s. C. 6 m/s. D. 2 m/s.
________ may form at the bottom of cockpits and may even be an important cause of cockpit karst topography
A) Stalactites B) Grabens C) River floodplains D) Sinkholes
Which of the following sites near a volcano might be relatively less dangerous?
A) A site that is within the shelter provided by the volcano's central crater B) A site on a ridge as opposed to a site in a valley C) A site protected by steep slopes of the volcano D) A site where rocks have been weakened by hot volcanic fluids E) All of these are correct.
The convective flow of liquid, metallic iron in the ________ is thought to generate Earth's magnetic field
Fill in the blank(s) with correct word