Graded bedding forms when ____
a. erosion planes off a portion of the sea bottom
b. sediment is deposited on a steep slope or grade
c. turbidity currents deposit first coarse-grained sediment then fine-grained sediment
d. cross-bedding is truncated at top and curved (or tangential) at bottom
e. turbidity currents deposit first fine-grained sediment then coarse-grained sediment
c
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When you set a pot of tap water on the stove to boil, you'll often see bubbles start to form well before boiling temperature is ever reached. Explain this observation.
A. These are dissolved salts heating up and escaping from the water. B. They are very minute pockets of water in the gaseous phase. When they get large enough, the water will boil as this gas escapes. C. These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. D. These initial bubbles are the gases that were dissolved in the water coming out of solution. The solubility of gases in water decreases with increasing temperature.
How are continental rift magmas and continental arc magmas different?
a) Continental arc magmas are more viscous than continental rift magmas. b) Continental arc magmas are less viscous than continental rift magmas. c) Continental arc magmas are less dangerous than continental rift magmas. d) Continental arc magmas are more dangerous than continental rift magmas.
A reverse biomass pyramid is typical of
A) terrestrial ecosystems because of the high concentration of sunlight. B) terrestrial ecosystems because land can support more animals than water. C) aquatic ecosystems because top consumers reproduce much more slowly and live much longer than producers. D) aquatic ecosystems because water contains much more oxygen than air.
Which of the following is not a human impact on atmospheric and oceanic circulation?
A) Asian air pollution affects monsoonal wind flow. B) Ongoing climate change may affect ocean currents and thermohaline circulation. C) Natural conditions like ENSO affect global weather patterns and affect human lives. D) Melting sea ice in the Arctic leads to a weakening of the jet stream. E) Reversal of the northeast trade winds.