Which of the following best summarizes the passage? Volcanic rocks and mountains are found in Santa Cruz.

Chert has a heavy concentration of silicon and oxygen.

Sand is tiny bits of worn-out rock made mostly of oxygen and silicon.

A few common elements make up most of the planet's many compounds.

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mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation:

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

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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.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.