The sedimentary environment from which coal most commonly is derived:a
desert d. glacial
b. shallow water marine e. organic reef
c. swamp
C
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How does bonding affect the hardness of a crystal?
A) Covalently bonded crystals are harder than ionically bonded crystals. B) Ionically bonded crystals are harder than covalently bonded crystals. C) Some ionically bonded crystals are harder than covalently bonded crystals, depending on the charges of ions involved. D) Some covalently bonded crystals are harder than ionically bonded crystals.
What is a disadvantage of using multibeam echo systems to map the entire seafloor?
a. It can only detect a single narrow corridor of the seafloor. b. There are many beams that radiate from the ship's hull. c. There are very few vessels that are actually outfitted with these systems. d. The systems send a pulse of sound every ten seconds.
A depression along the boundary of a seamount where sediment has built-up is a(n) ____
A) scour moat B) guyot C) island arc D) abyssal plain
________ soils are common in South America and Africa
A) Forest B) Rainforest C) Grassland D) Desert E) Wetland