Earth

Where are we?

Where is the Earth ? Good question.
The Earth from space.The Solar System,Our earth is in the middle of a family of planets that all move around our Sun.We call this the Solar System .So far ,life has not been discovered on any other planets besides Earth,but it soon might be!
Diving down a bit,we can now see a town in Detroit next door to the beach .But we still can't see any people down there .
Zoom in on a house and ,at last ,we can see people!Now look back at the Earth, and you 'll soon realize how big it is.It's absolutely enormous.
We think we know so much about the Earth and even about space,but what lies beneath our feet ?Imagine that the earth is an apple.The crust that we stand on would be as thick as the apple skin . That leaves a lot of something are else underneath.
May has only dug about 8 miles into the Earth ,which is only about a five-hundreth ofthe journey to the center.Scientists can only guess what is beneath,but we doknow that it is very,very hot.
Earth is made up of rocks.Granite is a typical contienental rock.Basalt is a typical ocean floor rock,and peridotite is a mantle rock.About 29 percent of theEarth's surface is made up ofland,which is divided into seven continents,apiece of land that is not broken up by sea.These are North America,South America,Europe,Africa,Australasia,Asia,and Antarctica.
Without mountains ,the Earth would look far less spectacular.About 5 percent of the wourld's land surface is made up of amazingh highland.The Himalayan Mountains,in Asia,are good example of fold mountains.The are 50 million years old,which is relatively new!Mount Everest in the Himalayas is the highest point on Earth.
Mountains are made when the Earth 's crust is pushed up in big folds or forced up or down in blocks.The 450 million-year old Scottish Highlands used to be craggylike the Himalayas,below,but wind and rain have worn them down.
Long lines of islands in the oceans are actuallythe tips of huge mountain ranges,which lie underwater .The island of Hawaii,Mauna Kea is the world's tallest mountain from the bottom of the sea to the tip.Block mountains are formed when the Earth's crust is movea up or down in blocks.Banff National park,Canada,is a spectacular eample of a block mountain.
The pressure builds up underground. Hot ,liquid rock,called magma,finds it's way to a weak part between the Earth 's plates and explodes.Welcome to the volcano.The force of an exploding volcano is enormous-like opening a can of shaken,soda.Chunks of molten rock as big as house can be flung high into the air ,and dust can travel as much as13 miles 20 km high.As the insides of the Earth explode out of the ground,the lava and ash settle,and over time a perfectly shaped mountain is formed .In effect,the Earth is turning a little bit of itself inside out.When magma pours out of volcanoes, it is call lava.It rolls slowly downhill in a huge river,burningeverything in its path .When it cools,it solidifies into rock, call igneous rock.In some volcanic areas,you can see heat coming up from under the ground.Mud bubbles and hot water jets,called geysers,shoot up hhigh. They sometimes smell of rotten eggs because of a gas called hydrogen sulfide.Imagine waking up one night to find the ground trembling and shaking.That's what it's like to feel an earthquake.These sudden movements in the Earth's plates can cause terrifying damage.When an earthquakehappen underwater,vibrations cause ripples in the sea .They grow and grow until they are enormous,deadly waves,onto the shore.An eathquake is caused when two of the Earth's plates slide against each other.The line that they slide along is called a fault.When they move,they cause vibrations across the ground.I like to talk what I saw in movie because I think the movie was very interesting and the technology used was very higher.