Chemical Processes in Earth and Life Systems

Front

What is the significance of ocean water in the early evolution of life on Earth?

Back

Ocean water offered protection against harmful radiation until an atmosphere could form.

Front

How did the weathering of rocks positively impact early life forms on Earth?

Back

The weathering of rocks increased, which produced soil and minerals that better supported life.

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NGSS.MS-ESS2-1

NGSS.MS-LS1-5

NGSS.MS-LS2-1

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Front

What is the relationship between the Earth's surface changes and the evolution of life?

Back

The changing surface of the Earth determined what kinds of organisms could exist.

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NGSS.HS-ESS2-7

NGSS.HS-LS4-5

Front

What biological process is responsible for introducing free oxygen to Earth's atmosphere?

Back

Photosynthesis.

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NGSS.HS-LS2-5

Front

What role did photosynthetic organisms play in the buildup of free oxygen two billion years ago?

Back

Photosynthetic organisms became more common on Earth.

Front

What was the composition of Earth's early atmosphere?

Back

Earth's early atmosphere contained very little free oxygen (O2).

Front

What is the oxygen cycle?

Back

The oxygen cycle is the process by which oxygen is produced and consumed in the environment, primarily through photosynthesis and respiration.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Front

What are the primary products of photosynthesis?

Back

The primary products of photosynthesis are glucose and oxygen.

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NGSS.HS-LS1-5

Front

How does cellular respiration relate to the oxygen cycle?

Back

Cellular respiration consumes oxygen and produces carbon dioxide, completing the cycle.

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NGSS.HS-LS2-3

NGSS.HS-LS2-5

Front

What is the role of unicellular organisms in Earth's early atmosphere?

Back

Unicellular organisms contributed to the oxygenation of the atmosphere through photosynthesis.