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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Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

In the presence of oxygen, glycolysis is followed a. the krebs cycle b. lactic acid fermentation c. alcoholic fermentation d. photosynthesis