Geologic Time Learning Cycle 1

Front

What is the preserved remains or traces of an organism known as?

Back

Fossil

Front

What is the earliest time in Earth's history when there was mostly just rocks and very little life called?

Back

Precambrian

Front

Which layer is the oldest in a geological sequence?

Back

Layer C

Front

What were the earliest fossils?

Back

Bacteria

Front

How old is the Earth?

Back

4.6 billion years

Front

What era is known for the emergence of complex life forms?

Back

Paleozoic Era

Front

What is the term for the process of dating rocks and fossils based on their position in layers?

Back

Relative dating

Front

What is the significance of the Mesozoic Era?

Back

It is known as the age of dinosaurs.

Front

What are the three main eras of the Phanerozoic Eon?

Back

Paleozoic, Mesozoic, Cenozoic

Front

What type of rock is primarily formed from the accumulation of sediment?

Back

Sedimentary rock