9th Grade End of Level Review

Front

What evidence do early telescopes provide about the distance of stars compared to planets?

Back

Stars must be much farther from Earth than planets.

Front

What process in primitive plants contributed to the formation of molecular oxygen in Earth's early atmosphere?

Back

Photosynthesis in primitive plants.

Front

What human activity is linked to an increase in average global temperatures?

Back

Increased use of fossil fuels.

Front

In what astronomical structure do stars begin their life cycle?

Back

A nebula.

Front

What can plants take in from both air and water?

Back

Carbon dioxide.

Front

What is the primary function of photosynthesis in plants?

Back

To convert light energy into chemical energy, producing oxygen and glucose.

Front

What is a nebula?

Back

A cloud of gas and dust in space, where stars are born.

Front

What is the greenhouse effect?

Back

The warming of Earth’s surface due to the trapping of heat by greenhouse gases.

Front

What role do fossil fuels play in climate change?

Back

They release carbon dioxide when burned, contributing to global warming.

Front

What is the significance of carbon dioxide in the atmosphere?

Back

It is a greenhouse gas that helps regulate Earth's temperature.