6.E.1.2 Why Earth Sustains Life Test Review

Front

What is the main reason life is less likely on the outermost planets compared to those closer to the sun?

Back

Their surfaces are extremely cold.

Front

Which planet is most similar to Earth?

Back

Mars.

Front

What is a key reason Mercury cannot support human life?

Back

It is too hot during the day.

Front

Why is Mars unable to sustain life while Earth can?

Back

Mars has no liquid water, but Earth does.

Front

How is Earth unique compared to other planets in the solar system?

Back

Water is found in all three phases on Earth.

Front

What is the significance of liquid water for sustaining life?

Back

Liquid water is essential for all known forms of life.

Front

What are the three phases of water found on Earth?

Back

Solid (ice), liquid (water), and gas (water vapor).

Front

Why do scientists believe Mars had liquid water in the past?

Back

Evidence of riverbeds and minerals that form in water have been found.

Front

What role does the sun play in sustaining life on Earth?

Back

The sun provides energy necessary for photosynthesis and climate regulation.

Front

What is the greenhouse effect?

Back

The process by which certain gases trap heat in the atmosphere, keeping Earth warm.