The current drought in the American Southwest is
A) typical of the region's history since the 1700s.
B) hardest on urban areas, since the region has little agriculture.
C) one of the most severe in the last 1,000 years.
D) less severe because there is surplus sustainable water available from deep wells.
C
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To make an ice cube, you fill a tray with liquid water which then freezes, making a coherent solid (a rock). Which rock type would the ice cube be?
a. Metamorphic b. Igneous – the water is akin to magma, and cooling magma creates an igneous rock c. Sedimentary
In tropical rainforests, vegetation layers are structured according to
a. how deep the rainfall penetrates into the forest b. the plant's needs for sunlight c. how well each plant handles predation by herbivores d. nutrient availability and uptake by plant roots e. tropical rainforests are not layered
The dirt wall left after contour mining is called a spoil
Indicate whether the statement is true or false
Multicelled organisms first appeared in the fossil record about 4.0 billion years ago. Indicate whether the statement is true or false