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Rills, brooks9, streams join each other to form rivers.

Correct option is (c) ocean

In some places, a river cascades down a sudden drop. This forms a waterfall.

Correct option is (c) Stars

The sun is the star that is closest to us.

Correct option is (a) coastal

Sea, bay, gulf, strait7, creek8 etc. are some water bodies formed along the coastal region.

(i) Sun

(ii) Asia

(iii) Australia

(iv) Landforms

(v) Rills

(vi) Rivers

(vii) Waterfall

(viii) Ozone

(ix) Kangaroos

All rivers eventually flow into the ocean.

Correct option is (c) Earth

1. The sun is a star and it is closer to us than any of the stars. 

2. Hence, it appears big and brilliant and does not twinkle like the distant stars.

1. Some spacecraft remain in space. 

2. Others are brought back to earth. 

3. Some land on other planets or satellites after the mission is complete.

Correct option is (c) seven

The land along the margins of an ocean is called a coastal region.

Water particles in the cloud freeze and in the cold regions, they come down in the form of snow

Mercury Venus, Earth, Mars, Jupiter/Saturn, Uranus and Neptune.

Correct option is (b) solar

1. Compared to the sun, the other heavenly bodies in the solar system are much smaller. 

2. As the moon is closest to the earth, it appears to be very big although it is actually very much smaller than the sun.

Correct option is (b) orbit

A water body formed by water collecting naturally in a low lying area of land is called a lake.

Huge blocks or mass of ice floating in the sea are called icebergs.

1. All things on the earth remain on it due to the earth’s gravity. 

2. So, even if we throw something upward with a great force, it finally falls back to the ground.

Correct option is (b) sun

Some smaller heavenly bodies that revolve around the sun are called dwarf planets.

Our solar system has eight planets.

1. The sun exerts a gravitational pull on all planets whereas the tendency of the planets is to move away from the sun. 

2. As a result of these two forces, a planet keeps revolving around the sun at fixed distance, in a fixed orbit. 

3. In this way the satellites revolve around their planets.

The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Living things occupy parts of the lithosphere, hydrosphere, and atmosphere. Living things and all the parts they occupy are together called the biosphere.

(a) Anil lives at the foot of a hill. 

(b) Ria lives in the plateau region.

Correct option is (c) revolve

Correct option is (c) space

There is a lot of water stored in the underground layers of rock. This water is called ground water.

1. Dwarf planets are smaller heavenly bodies that revolve around the sun. 

2. The most well known is Pluto. 

3. They revolve around the sun independently. 

4. They have their own orbit.

1. Small heavenly bodies between the planets Mars and Jupiter are called asteroids. 

2. They move in a form of a band and are numerous. 

3. They revolve around the sun.

1. Man-made satellites provide useful information for agriculture, environment, weather forecasting, map making and searching for water and mineral wealth on the earth. 

2. They are also used for telecommunication.

(a) Mass Orbit Mission

(b) 5 November 2013 

(c) 24 September 2014 

(d) one 

(e) unmanned 

(f) Deeper study of the moon and mass.

(Personal response) Landforms e.g. mountain, hill, hillock, valley, plains, plateaus, river etc. (Students are supposed to write their own answers)

All heavenly bodies exert a force of attraction or a pull on one another, this is called the force of gravity.

Correct option is (a) gravity

The water or ice that occupies the earth’s surface, ground water and the water vapour in the atmosphere together form the earth’s hydrosphere.

Correct option is (b) springs

Correct option is (b) moon

Due to earth’s gravity all things fall down to the ground.

Correct option is (c) stars

The envelope of air around the earth is called the atmosphere.

We see the rainbow in the troposphere.

Correct option is (c) lithosphere

Correct answer is Rain

Correct option is (b) ozone