The Earth Flashcards

0
Q

What is a solar energy and where do we get it from?

A

A solar energy is what provides us heat and light from the Sun

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1
Q

Why is the earth called the “MIRACLE PLANET”?

A

The earth is called the miracle planet because it’s the only planet that contains living things and supports life because of water and oxygen.

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2
Q

Describe Earth’s shape

A

Earth is a sphere that is slightly flattened in the North and South Pole and bulgees out in the Equator.

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3
Q

how much space does the water cover the earth’s surface?

A

More than two thirds

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4
Q

how much space does the mountains cover the earth’s surface?

A

Almost one tenth

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5
Q

how much space does the forest cover the earth’s surface?

A

Almost 1 quarter (1 fourth)

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6
Q

how much space does the dessert cover the earth’s surface?

A

1 eight

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7
Q

When was the earth formed?

A

4.5 billion years ago

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8
Q

Name the layers of the earth

A

Crust
Mantle
Core (outer and inner)

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9
Q

How does the heat from core affect the movement of magma?

A

The heat that the core generates causes the magma from the mantle to move upwards

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10
Q

Which layer is made up of nickel and iron?

A

Inner core

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11
Q

What are magma?

Distinguish the difference between lava and Magma

A

Magma are the molten or semi-molten rocks that forms the mantle beneath the crust

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12
Q

What are plates?

A

A rigid layer of the Earth’s crust that is believed to drift slowly.
They are broken but fit perfectly well like a jigsaw.

Seperate sections into which the crust of the earth is broken
they float on top of SEMI MOLTEN magma

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13
Q

What are plate boundaries?

A

The place where two plates meet and is usually associated with earthquakes, fold mountains and tsunamis

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14
Q

What is crust consist of?

A

Solid rocks

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15
Q

Describe the Plates tectonics?

A

The theory of the earth crust is broken into a number of constantly moving plates is called the Plate Tectonics

16
Q

Describe how two plates collide

A

When two plates collide,they build up a huge pressure and the heavier plate is forced to move down into the mantle,where it melts.Since a crust is destroyed,this is called DESTRUCTIVE BOUNDARY

17
Q

Name two plates in collision

A

Nazca plate and the American plate

18
Q

Describe how another crust is formed

A

When plates pull apart, molten magma rises from the mantle,where it cools and forms a new crust.

As a result, this is called a Constructive boundary

19
Q

Explain how the plates move

A

Plates move because of convection currents