The The EarthEarth

• Our Planet is not perfectly round. It Our Planet is not perfectly round. It bugles at the equator and is flatter at bugles at the equator and is flatter at the polesthe poles

• About 70% of earth is covered with About 70% of earth is covered with water nearly all of earth’s water is water nearly all of earth’s water is found in oceans, which are salty. found in oceans, which are salty. Only 3% is drinkable freshwaterOnly 3% is drinkable freshwater

The Earth The Earth SizeSize

• Four planets in our Four planets in our solar system are solar system are larger and three are larger and three are smaller than earth.smaller than earth.

• Earth has a Earth has a diameter of 7,926.2 diameter of 7,926.2 miles (12,756km) miles (12,756km)

• The Moon (Latin: The Moon (Latin: LunaLuna) is Earth's only ) is Earth's only natural satellite and the fifth largest natural satellite and the fifth largest natural satellite in the Solar System.natural satellite in the Solar System.

The Moon’s The Moon’s SizeSize

• Mean radiusMean radius1,737.10 1,737.10 km  (0.273 Earths)km  (0.273 Earths)

• Equatorial Equatorial radiusradius1,738.14 km  1,738.14 km  (0.273 Earths)(0.273 Earths)

• Polar radiusPolar radius1,735.97 1,735.97 km  (0.273 Earths)km  (0.273 Earths)

Phases of the Phases of the Earth Earth

• From earth, we see phases of the moon From earth, we see phases of the moon (new, first quarter, full, last quarter) as the (new, first quarter, full, last quarter) as the angle between the earth, moon, and sun angle between the earth, moon, and sun changes. When the moon is full, for changes. When the moon is full, for example, the three objects lie roughly in a example, the three objects lie roughly in a line in the order sun, earth, moon, and the line in the order sun, earth, moon, and the moon appears full because we are seeing moon appears full because we are seeing mostly the part of the moon which is in mostly the part of the moon which is in daylight. (When they are lined up exactly, daylight. (When they are lined up exactly, the moon actually crosses through the the moon actually crosses through the shadow of the earth and we see that as a shadow of the earth and we see that as a ``lunar eclipse.'') ``lunar eclipse.'')

Motion of the Motion of the earthearth

• Earth's rotationEarth's rotation is the rotation of the solid is the rotation of the solid Earth around its own axis. The Earth rotates Earth around its own axis. The Earth rotates towards the east. As viewed from the North towards the east. As viewed from the North Star Polaris, the Earth turns counter-Star Polaris, the Earth turns counter-clockwise.clockwise.

• Each orbit by a member of the solar system is its revolution. A revolution is also called a year. The Earth takes 365.25 day to revolve around the sun. It is during this year or revolution that brings Earth it’s seasons.

The Following Questions Are The Following Questions Are Multiple Choice Questions.Multiple Choice Questions.