Earth - Third Planet from the Sun

Earth - is the largest of the terrestrial planets

Earth - It is the only known planet to support life

Atmosphere, Climate, Water, Light, Sun - Why Earth is the best planet in the Solar System that can support life?

Atmosphere - Oxygen is constantly put by plants and trees.

Atmosphere - Is thick enough to prevent poisonous rays of radiation from getting through it.

Climate - There is a moderate amount of carbon dioxide in the planet's atmosphere.

Climate - The temperature on Earth does not go from one extreme to the other either

Water - Other liquids contain poisonous elements.

Water - can be found anywhere, in its three states (solid, liquid and gas)

Light - Plants need sunlight in order to grow

Light - Earth spins on its axis in a span of 24 hours

Sun - To allow life to be created and to support it, earth receives the perfect amount of heat and light.

Sun - gravity keeps earth in its orbit.

Geosphere - It is consist of three major layers: core, mantle, and crust.

Outer Core - 1400 miles thick and combination of iron, alloy, and nickel.

Inner Core - about 750 miles thick and made up primarily of iron.

Mantle - accounts the big volume of the earth

Mantle - covers the core and lies beneath the crust

Outermost Mantle - is cool, strong, and hard

Innermost mantle - is hot, rock is not stable, soft, plastic, and flows slowly.

Crust - outermost layer

Crust - a thin veneer below a layer is soil and beneath the ocean water.

Crust - composed almost entirely of solid rock

Hydrosphere - It is the liquid water component of the earth which circulates among oceans, continents, glaciers, and the atmosphere.

Ocean - makes up 71% of Earth

Glaciers - cover about 10% of Earth’s land surface today.

Atmosphere - mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth.

Atmosphere - It supports life by regulating climate by acting as a blanket and filter, retaining heat at night and shielding us from direct solar radiation during the day.

Troposphere - 10 km. from the earth’s surface

Troposphere - Formation of weather

Jet stream - are fast flowing, narrow, meandering air currents

Tropopause - border between tropopause and stratosphere

Stratosphere - 30km – 50 km from Earth’s surface

Stratosphere - Ozone layer

Mesosphere - The “middle layer”

Mesosphere - 50km – 90 km above Earth’s surface

Mesosphere - Coldest region of the atmosphere

Mesosphere - The layer where most meteors burn up upon atmospheric entrance

Mesopause - border between mesosphere and thermosphere

Thermosphere - Sun’s radiation strips off

Thermosphere - “Ionosphere”

Thermosphere - 90km – 400km above the Earth’s surface

Thermosphere - Occasionally seen is the aurora borealis and aurora australis

Thermosphere - Many satellites actually orbit the Earth within thermosphere

Exosphere - Topmost part of the atmosphere

Exosphere - Composes of hydrogen and helium

Exosphere - Thinnest region of the atmosphere

Exosphere - 400km – 500km above Earth’s surface

bios - life in greek

sphaira - sphere in greek

Biosphere - all about life. All of the microbes, plants, and animals can be found

Biosphere - extends to the upper areas of the atmosphere where birds and insects can be found. It also reaches to dark caves deep in the ground or to the bottom of the ocean at hydrothermal vents.