YEAR 4 SCIENCE CHAP 9

What is an earth?

• The fourth planet from the Sun

• Earth is the smallest planet in solar system

• Earth is the third planet from the Sun

• Earth has 3 elements

Name the 4 elements of the earth

• Fire, sand, water, Sun

• Sun, water, moon, air

• Air, Fire, Land, Water

• Water, land, moon, Sun

Earth rotates Sun and it takes 1 and 1/2 year

• True
• False

Answer explanation

Earth rotates Sun and it takes 1 year to complete a full orbit

Earth exists approximately

• 1.5 billion years ago

• 2.85 billion years ago

• 8.25 billion years ago

• 3.24 billion years ago

Answer explanation

Earth is made from the particles that present from Sun's creation, and it exists approximately 8.25 billion years ago

All objects on the Earth pulls towards the center of the Earth and it is known as elastic energy

• True
• False

Answer explanation

All objects on the Earth pulls towards the center of the Earth and it is known as gravitational pull

How long it takes for the Earth rotates on its own axis?

• 12 hours

• 1 day

• 16 hours

• 8 hours

Answer explanation

Earth takes 24 hours/1day to complete one rotation on its own axis

It takes one year for Earth to complete one full orbit around the Sun. What is the name of this phenomena?

• Rotation

• Lapse

• Leap year

• Revolution

Answer explanation

Revolution is the duration taken by the Earth to complete one full orbit around the Sun

The apple falls down to the ground due to the gravitational force

• True
• False

What is the importance of the leap years?

• To have daytime and nightime

• To make sure the seasons occur at the correct time

• To make the Earth have extra hours in one day

• To make the revolution longer

Why the shadow of a pole is different according to different time?

• The Sun's position

• The length of the pole

• The gravitational pull

• The Earth moves from west to east

Answer explanation

The Earth moves from west to east when it rotates on its own orbit. This makes the Sun moves from East to West, changing the shape and the position of the shadow of an object.