Unit 3 LS2 Formation of Earth & Vocab Check-In

Front

What is a nebula?

Back

A cloud of dust and gases in space, often the birthplace of stars.

Front

What was the first life on Earth?

Back

Bacteria, which are single-celled organisms.

Front

How did Earth get its moon?

Back

The moon formed when another mars-sized planet smashed into Earth, and the debris that flew off coalesced to form the moon.

Front

What was Earth's early atmosphere primarily composed of?

Back

Carbon dioxide.

Front

What is a fossil?

Back

The remains of an organism that have been preserved in rock.

Front

What is the significance of carbon dioxide in Earth's early atmosphere?

Back

It played a crucial role in the formation of the planet's climate and the development of early life.

Front

What are eukaryotes?

Back

Organisms whose cells have a nucleus enclosed within membranes, including plants and animals.

Front

What is the difference between a comet and an asteroid?

Back

Comets are icy bodies that release gas or dust, while asteroids are rocky bodies that do not.

Front

What is the process of planetary formation?

Back

The process by which dust and gas in a protoplanetary disk coalesce to form planets.

Front

What role do fossils play in understanding Earth's history?

Back

Fossils provide evidence of past life forms and help scientists understand the evolution of species.