CKLA Grade 1 Domain 7

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

Salt is an important mineral that is used by people

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

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

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

Pressure happens when two forces push on each other

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

The earth has two layers: the crust and the core

Layer: when it is cold outside, we wear many layers of clothing to keep warm

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

Surface: the surface of the earth is all of the liquid rock that is deep inside

We live in the core of the earth

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

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

Varies: when something varies, it always stays the same

Preserved: when you want to save something for the future, you keep it preserved in a safe place

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

A geologist is a scientist who studies clouds and the sky

Characteristics: the characteristics of rocks include their colors, textures, shapes, and sizes

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

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

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

A geyser is an eruption of lava

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

The earth’s surface is covered by continents and oceans

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

The earth is shaped like a sphere or a ball