Absolute age of rocks

Geologists find absolute ages by measuring the amount of certain radioactive elements in the rock.

is for Big Bang Theory

The idea that  the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density

is for Cambrian Period

The Cambrian Period was the first of the Paleozoic era. It lasted for 55.6 million years.

is for Divergent Boundary

Linear Feature that exsist between two tectonic plates that are moving apart.

is for Extinction

The dieing out of a speices.

is for Fossils

The remains of animals or plants left over time.

is for Geological Time Scale

System of  chronological dating that relates geological strata to time.

is for  Hubble space telescope

A telescope launched into orbit around the earth in 1990 to provide information about the universe in the visible, infrared, and ultraviolet ranges.

is for Igneous Rock

Rocks that are formed by the cooling and solidifying of molten materials.

is for Jovian Planets

Any of the four outter gas planets.

is for Kilometer (KM)

Distance equivalent to 1,000 meters.

is for Layers of the Earth

The interior structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.

is for Motion

the action or process of moving or being moved.

is for Neap Tide

a tide just after the first or third quarters of the moon when there is the least difference between high and low water.

is for Orbit

The path something takes to go around something else.

is for Paleozoic Era

The Paleozoic Era spans almost 200 million years from 542 to 251 million years ago. It is defined by great explosion of life at the beginning of the era and ends with the largest mass extinction in the history of our planet.