Which statement best expresses the central idea of the first paragraph?
a
new york city is surrounded by water.
b
proximity to water makes climates more moderate.
c
the air at higher elevations is generally cooler than the air at sea level.
d
water has no effect on climates, but it makes temperatures fluctuate.

B

Explanation:

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.