The earth in the Solar System and its environment

Question 1

What is Earth?

Answer 1

One of the solar bodies that revolves around the sun

Question 2

Mercury

Answer 2

Nearest to earth and hottest

Question 3

Mars

Answer 3

Has life

Question 4

Jupiter

Answer 4

Largest

Question 5

Pluto

Answer 5

Farthest from earth and coldest of all

Question 6

Distinction between planet and stars

Answer 6

Planet does not burn naturally
Revolves around the star
Star burns its own fuel for the production of energy
Revolves around another star or galaxy.

Question 7

Sun

Answer 7

Major source of light and energy for all the planets.
Light takes 8.5 minutes to reach the surface of the earth.
The sun burns its own fuel said to be nuclear fuel in the form of hydrogen.

Question 8

Diameter of earth

Answer 8

12750 km

Question 9

Earths Crust

Answer 9

Mantle of rocks.
Heterogeneous in nature.

Question 10

Types of crust

Answer 10

Thin oceanic crust beneath the ocean basins
Thicker continental crust that is the feature of the continents.

Question 11

Earths Mantle

Answer 11

Most of earths mass is concentrated.
Consists of upper and lower mantle separated by transition zone

Question 12

Temperature of mantle

Answer 12

Lowest below the crust.
Highest where the mantle material is in contact with the heat producing core.

Question 13

Earths Core

Answer 13

It constitutes the center of the earth
Source of internal heat which is the outcome of radioactive materials which proceeds with release of heat energy.

Question 14

Types of Core

Answer 14

Inner and outer core.
Inner: solid even though its temperature is higher than the outer core.
Outer: Iron and nickel alloy. It is a liquid because temperature there is adequate to melt the iron-nickel alloy.

Question 15

Chemical composition

Answer 15

Made of iron-magnesium silicates.
Surrounds the core and makes up the bulk of the earth