World Earth Day

Is it true the distance of the Moon and the Earth is constant?

• Yes

• No

The Earth is the ... planet from the Sun in the Solar System.

• 5th

• 2nd

• 1st

• 3rd

Is it true that terrestrial planets emit light of theirown?

• No

• Yes

Is it true the Earth's axis of rotation is perpendicular to the orbital plane?

• Yes

• No

Is it true that the Earth's axis of rotation is perpendicular to the orbital plane?

• No

• Yes

When did the Earth form?

• 2,5 billion years ago

• 10 billion years ago

• 4,5 billion years ago

• 1 billion years ago

What is the primary cause of tide on Earth?

• the greenhouse effect

• the change of seasons

• the Moon's gravity

Is it true that the thickness of the oceanic and the continental crust is different?

• Yes

• No

What is the average thickness of the Earth's crust?

• 30 km

• 100 km

• 40 km

• 15 km

The Earth has the ... density among the terrestrial planets in the Solar System

• 2nd largest

• largest

• 5th largest

• 3rd largest