Geological Time and Rock Cycle Flashcard 2025

Front

Who developed the concept of the Rock Cycle in the 18th century?

Back

James Hutton.

Front

What type of rock is gneiss classified as?

Back

Metamorphic.

Front

What is the name of hot molten rock under the earth's surface?

Back

Magma.

Front

What does the geologic time scale represent?

Back

The theorized development of life on earth dating back 4.6 billion years ago.

Front

Which geological time period represents the longest duration?

Back

Precambrian.

Front

What are the three main types of rocks?

Back

Igneous, Metamorphic, Sedimentary.

Front

What process transforms sediment into sedimentary rock?

Back

Lithification.

Front

What is the primary difference between igneous and metamorphic rocks?

Back

Igneous rocks form from cooled magma or lava, while metamorphic rocks form from existing rocks under heat and pressure.

Front

What is the significance of fossils in the geological time scale?

Back

Fossils provide evidence of past life and help date the layers of rock.

Front

What is the process called when rocks are broken down into smaller pieces?

Back

Weathering.