1/2 Fall24 Understanding Our Solar System

Front

Why does the Earth have many fewer craters than Mercury, Mars, and the Moon?

Back

Earth has plate tectonics and an atmosphere that erases craters.

Front

What are terrestrial planets primarily made of?

Back

Terrestrial planets are denser and rocky due to their formation from heavier materials in a hotter region.

Front

How do scientists determine the ages of different objects in our solar system?

Back

They look at the ratio between radioactive parent material and stable daughter materials in rocks.

Front

What is the estimated age of our Earth and solar system?

Back

4.5-4.6 billion years old.

Front

What surface process creates stability on a planet's surface?

Back

No atmosphere.

Front

What are gas giants primarily composed of?

Back

Gas giants are less dense and primarily composed of gases.

Front

What role do solar winds play in the formation of planets?

Back

Solar winds blew the less dense material to the outer, cooler area of the solar system.

Front

What is the significance of plate tectonics on Earth?

Back

Plate tectonics help erase craters and shape the planet's surface.

Front

What is the difference between terrestrial planets and gas giants?

Back

Terrestrial planets are rocky and denser, while gas giants are less dense and composed mainly of gases.

Front

How do craters on a planet's surface indicate its age?

Back

More craters generally indicate an older surface, as fewer impacts have occurred on younger surfaces.