Age of Earth

Age of a rock compared to the ages of other rocks, such as "this rock is older than the rest in the area".

• Absolute Age

• Law of Superposition

• Relative Age

• Unconformity

Tags

NGSS.MS-ESS1-4

the number of years that have passed since the rock was formed, such as, "this basalt layer is 1000 years old +/- 20 years".

• absolute age

• law of superposition

• relative age

• unconformity

Tags

NGSS.MS-ESS1-4

In undisturbed horizontal layers of sedimentary rock, the oldest rocks are found at the bottom. Each higher layer is younger than the layer(s) below it.

• absolute age

• law of superposition

• relative age

• unconformity

Tags

NGSS.MS-ESS1-4

A gap in the geologic record due to erosion. Where new rock layers meet a much older rock surface beneath them.

• absolute age

• law of superposition

• relative age

• unconformity

Tags

NGSS.MS-ESS1-4

Lava that hardens on the Earth's surface, forming igneous rock is an example of:

• extrusion

• fault

• index fossil

• intrusion

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

Magma pushes into rock layers below the surface of the earth where it cools and hardens into igneous rock.

• extrusion

• fault

• index fossil

• intrusion

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

Always younger than the rock layers that it cuts through, this break in Earth's crust is caused by forces acting on the rocks on either side.

• extrusion

• fault

• index fossil

• intrusion

Tags

NGSS.MS-ESS2-2

Widely distributed and representing an organism that existed for a geologically short period of time, they are useful in finding relative age of rocks they are found in.

• extrusion

• fault

• index fossil

• intrusion

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

The breakdown of radioactive elements over time, where the atoms of one element break down to form atoms of another element.

• half-life

• law of superposition

• radioactive decay

• relative age

Tags

NGSS.HS-PS1-8

The time it takes for half of the radioactive atoms to decay. This rate never changes.

• half-life

• law of superposition

• radioactive decay

• relative age

Tags

NGSS.MS-PS1-1