Volcanic mudflows (lahars) are common on composite volcanoes because
A) large amounts of rain and snowmelt mix with loose ash on steep slopes.
B) hot mud commonly erupts from their central craters.
C) such volcanoes form preferentially in rainy tropical locations.
A) large amounts of rain and snowmelt mix with loose ash on steep slopes.
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African dust from the Sahara desert is observed across the Atlantic as far west as the Caribbean region where it produces a hazy sky condition during the annual dry season
You are a climate scientist and make a prediction that the Sahara was not a desert during glacial periods in the northern hemisphere. How could you test this hypothesis by looking at deep sea sediments from the Atlantic off west Africa? A) You could look at the sediments to see if there were biogenic sediments interbedded with sediments with terrigeneous input corresponding to the dry, interglacial intervals. B) You would look at fossils to see if there were organisms that preferred dusty conditions vs. clear water conditions. C) You could measure the isotopes in the sediment to estimate the sea surface temperatures. D) The hypothesis is untestable with deep sea sediment.
Air, after being heated by conduction and radiation:
a. expands in volume and increases in density. b. expands in volume and decreases in density. c. decreases in volume and increases in density. d. decreases in volume and decreases in density.
Urban core areas are called CBDs (Central Business Districts)
Indicate whether the statement is true or false
a-Ketoglutarate is involved in both transamination and oxidative deamination. Which of the following describes its involvement in these two processes?
A) It is a product of both transamination and oxidative deamination. B) It is a reactant in both transamination and oxidative deamination. C) It is a reactant in oxidative deamination and a product in transamination. D) It is a reactant in transamination and a product in oxidative deamination.