The Earth’s BIG FeaturesGrade 3

Social Studies

Deserts Approximately one-third of

the Earth's land surface is desert. Desert is an area of land that receives very little rain and has very little vegetation .

Deserts Deserts can generally

be found in low-lying, flat areas where precipitation by rain is blocked by mountain ranges or wind currents that prevent cool wet air from reaching a destination.

Deserts Deserts generally are

made up of sand or loose dirt. While most deserts appear light brown or tan in color, many can appear red, grey or even green depending on the type of rock that was eroded.

Peninsulas When a piece of

land extrudes into a body of water and is surrounded by at least three sides, it can be termed a peninsula.

Peninsulas In this image, the small

piece of land is connected to the main land by a narrow land bridge or isthmus.

Peninsulas However, not all

peninsulas are shaped in this fashion. Many peninsulas have a triangular shape with a tip out into the water.

Islands Islands are pieces of land

smaller than continents that are surrounded by a body of water, including oceans, seas, lakes, and rivers.

Continents A continent is defined

as a large unbroken land mass completely surrounded by water, although in some cases continents are (or were in part) connected by land bridges..

ContinentsThe seven continents

are North America, South America, Europe, Asia, Africa, Australia, and Antarctica.

The United States is located in North America.

Mountains Over long periods of time,

mountains are created by tremendous forces in the earth with a steep top usually shaped up to a peak or ridge. Mountains occur more often in oceans than on land. Some islands are the peaks of mountains coming out of the water.

Mountains Mountains are formed by

volcanism, erosion, and disturbances or uplift in the earth's crust. Most geologists believe that the majority of mountains are formed by geological forces heat and pressure producing changes under the earth's crust and movements in the earth's crust.

Mountains

and pressure producing changes under the earth's crust and movements in the earth's crust.

Rivers and Streams Rivers? Streams?

Creeks? They are all names for water flowing on the Earth's surface.

Rivers and Streams I tend to think of

creeks as the smallest of the three, with streams being in the middle, and rivers being the largest.

Oceans Oceans are the

largest bodies of water in the world. Ocean water is saltwater, and covers three fourths of the earth’s surface.

Oceans The world has four

oceans, named the Atlantic Ocean, Pacific Ocean, Indian Ocean, and Artic Ocean.