Domain 7: History of the Earth

Dinosaurs are extinct because there are no more dinosaurs left on the earth.

Layers of sediments, or pieces of rock and dirt, pressed on top of one another form sedimentary rocks.

A volcano is caused by an eruption of magma making its way to the surface of the earth.

We know that dinosaurs lived on earth because of fossilized bones that have been found.

Some volcanoes can be destructive when their lava and ash damage the land around them.

Fossils are the imprint of the remains of animals and plants that died long ago.

The earth's surface is covered by continents and oceans.

A geologist is a scientist who studies clouds and the sky.

When something varies, it always stays the same.

A geyser is an eruption of lava.

Fossils are pieces of rock that come from the eruption of a geyser.

The surface of the earth is all of the liquid rock that is deep inside.

The earth has two layers; the crust and the core.

The equater is an imaginary line that runs from the North Pole to the South Pole.

The mantle is the outermost layer of the earth where we live.

The inner core is a solid metal ball in the center of the earth.

Heat, pressure, and time cause many changes inside the earth.

All rocks can be put into three groups: igenous, sedimentary, and metamorphic.

The characteristics of rocks include their colors, textures, shapes, and sizes.

Something is solid when it takes the shape of whatever container it is in.

Pressure happens when two forces push on each other.

We know about the history of the earth because of the workd of many scientists who study rocks and fossils.

We live in the core of the earth.

Salt is an important mineral that is used by people.

The earth is shaped like a sphere or a ball.

The crust is a layer of liquid rock deep inside the earth.

When you want to save something for the future, you keep it preserved in a safe place.

When it is cold outside, we wear many layers of clothing to keep warm.