Unit 6.1: Evidence for Change on Earth

Front

What is the principle that states younger rocks lie above older rocks if the layers have not been disturbed?

Back

Superposition

Front

What is the theory that Earth's outer layer is made up of large, moving pieces called tectonic plates?

Back

Plate tectonics

Front

What is the layer of rock between the Earth's crust and core called?

Back

Mantle

Front

What is an index fossil?

Back

A fossil used to establish the age of a rock layer because it is distinct, abundant, and widespread, and the species existed for a short span of geologic time.

Front

What is the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle?

Back

Lithosphere

Front

What is the Earth's crust?

Back

The outermost layer of the Earth, composed of solid rock and soil.

Front

What is the core of the Earth?

Back

The innermost layer of the Earth, composed mainly of iron and nickel.

Front

What is the difference between the lithosphere and the asthenosphere?

Back

The lithosphere is the rigid outer layer of the Earth, while the asthenosphere is the semi-fluid layer beneath it that allows tectonic plates to move.

Front

What is plate tectonics?

Back

The scientific theory that describes the large-scale movements of Earth's lithosphere, which is divided into tectonic plates.

Front

What are tectonic plates?

Back

Large, rigid pieces of the Earth's lithosphere that move and interact at their boundaries.