At 13 Percent,the Proportion of U

question 37

Multiple Choice

At 13 percent,the proportion of U.S.residents born in another country is higher than it has been since

• A) 1850
• B) 1910
• C) 1940
• D) 2000

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Definitions:

Pyroclastic Flow

A hot, fast-moving and deadly mixture of gases, ash, and volcanic material produced by explosive eruptions.

Scoria

A highly vesicular, dark colored volcanic rock that may or may not contain crystals, typically formed from the cooling of lava.

Tephra

Volcanic material ejected into the air during an eruption, including ash, bombs, and blocks, which can affect wide areas downwind of a volcano.

Composite Volcano

A type of volcano formed by alternating eruptions of lava and volcanic ash, leading to a layered structure.