A population pyramid for a developing country would be narrower at the bottom than in the middle, indicating that there are fewer children than middle-aged people.

a. true
b. false


b. false

Environmental & Atmospheric Sciences

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Rainwater causes chemical weathering by

A. removing rock's surface layer. B. applying a force to rock. C. adding water molecules to rock. D. taking minerals out of rock and putting them in solution.

Environmental & Atmospheric Sciences

All dunes have crests oriented perpendicular to the direction of wind movement

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

June 21 is an equinox date

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

Non-conventional oil sources include all of the following except

A. tar sands. B. biofuels. C. coal. D. liquified natural gas.

Environmental & Atmospheric Sciences