In the past 100 years the average temperature in the united states has increased by
a. an amount too small to measure.
c. 10°
c.
b. 2°
c.
d. 20°
c.

2 degrees

Explanation:

In the past 100 years the increase in the average temperature is 2 degree. This is because of the global warming that there is a increase in the overall temperature.

The release of more and more carbon dioxide in the environment has lead to increase in the absorption of solar radiation.

The carbon dioxide has the ability to absorb heat from the atmosphere. More carbon dioxide will trap more heat from the atmosphere and thus increasing the global temperature.

every el niño cycle is different. every year.

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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.