peperonity.net
Welcome, guest. You are not logged in.
Log in or join for free!
 
Stay logged in
Forgot login details?

Login
Stay logged in

For free!
Get started!

Text page


planet earth in space zps c - Newest pictures
science.facts.peperonity.net

~≈♥Planet Earth♥≈~

Planet Earth is a dense, rocky ball about 7,920 miles (12,750 km) across. It is one of nine planets circling our local star, the Sun. Earth isthe only planet we know of that can support life. From space, its surface looks blue and cool, but inside it is so hot that rock can melt.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
HOW WAS EARTH FORMED?
__
The Sun began to form around 5 billion years ago out of a cloud of whirling dust and gas in space. As it formed, the Sun’s gravity gradually pulled the dust and gas into lumps, which became the planets. At first, Earth was a ball of molten rock. Its surface rock slowly began to cool andharden around 4 billion years ago.
Table 16. EARTH’S FORMATION
5.0 billion years ago The solar system begins to form from gas and dust swirling in space.
4.6 billion years ago Earth begins to form as a ball of molten rock.
4.5 billion years ago Volcanoes erupt gas and steam to form the oceans, and molten rock.
4.2 billion years ago Earth’s surface cools and the hard outer crust forms.
3.6 billion years ago The first continents form; life begins on Earth.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
IS EARTH THE SAME ALL THE WAYTHROUGH?
__
Our planet is made of four main layers. The outer layer is called the crust. Below is the mantle, which is solid near the top and molten below. Temperatures become hotter near Earth’s center. The outer core is a mass of molten rock. The temperature of the inner core is over 9,000°F (5,000°C).
ºôººôººôººôººôººôºôººôººôººôº°ºôº
EARTH’S STRUCTURE
__
The crust is made up of oceanic crust,below the oceans, and continental crust, which carries Earth’s land. It is Earth’s thinnest layer, at only 4–43 miles (6–70 km) thick. The mantle, at1,800 miles (2,900 km) deep, is the thickest layer. The outer core is around 1,240 miles (2,000 km) thick. The inner core at the center of Earth is about 1,702 miles (2,740 km) across.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
EARTH’S ATMOSPHERE
__
Earth’s atmosphere is a layer of gasesabout 430 miles (700 km) thick. Without the atmosphere, there could be no life on Earth. It protects us from harmful rays in sunlight and prevents our planet from becoming too hot or too cold.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
EARTH’S OCEANS
__
Earth’s oceans cover almost two-thirds of its surface, making the planet look blue from space. The oceans formed 4.5 billion years ago, as Earth’s surface cooled.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
HOW DOES EARTH SUPPORT LIFE?
__
Earth is just the right distance from the Sun so that temperatures are neither too hot nor too cold for livingthings to survive. Earth’s atmosphereand oceans also help to control temperatures. And Earth has air and water- both vital for life.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
HOW DOES EARTH MOVE THROUGH SPACE?
__
Earth takes one year, or 365.242 days, to orbit, or travel, around the Sun. At the same time, it spins on its axis (an imaginary line joining the North and South poles). As it spins, Earth is tilted on its axis at an angle of 23.5°. This tilt produces the SEASONS .
Earth spins around on its axis once every 24 hours. This brings day to theregions facing the Sun and night to those facing away from the Sun.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
SEASONS
__
Seasons are regular weather patternsin different places on Earth’s surface caused by the planet’s tilt. At any time, one hemisphere (half of Earth above or below the equator) leans toward the Sun, exposing it to more of the Sun’s light and heat and bringing warm summer days. The other half tilts away and has winter.
ºôººôººôººôººôººôºôººôººôººôº°ºôº
DO ALL PARTS OF EARTH HAVE SEASONS?
__
Most regions experience seasonal change throughout the year. However, the seasons are least noticeable in tropical regions near the equator (an imaginary line around Earth’s middle) because the equator does not tilt away from the Sun for part of the year.


This page:




Help/FAQ | Terms | Imprint
Home People Pictures Videos Sites Blogs Chat
Top
.