When warm air advances into cooler air, a warm front is formed
Indicate whether the statement is true or false.
Answer: TRUE
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A reasonable goal is to reduce global population growth by year ____ to level off around ____ billion.
A. 2040; 8 billion B. 2020; 8 billion C. 2040; 13 billion D. 2020; 6 billion E. 2060; 5 billion
Since 1950, aquaculture production has
a. declined by half b. increased almost seven-fold c. increased over 40-fold d. stayed exactly the same as the wild fish catch e. declined by about 10%
The difference between the "moist" and "dry" adiabatic rates is due to:
a. the fact that saturated air is always unstable. b. the fact that an unsaturated air parcel expands more rapidly than a saturated air parcel. c. the fact that moist air weighs less than dry air. d. the fact that latent heat is released by a rising parcel of saturated air
Which of the following types of volcanic eruption have occurred on Mount St. Helens since it began erupting in 1980?
A. pyroclastic flow B. eruption column C. volcanic dome D. All of these choices are correct.