revision week

There are____________countries in Arab World

• 20

• 22

• 24

moon's diameter is __________ of earth's mass.

• 1/40

• 1/60

• 1/80

Large dark hollow hole covering the moon’s surface.

• aestroids

• planet

• craters

Asteroids are small rocky body orbiting the ______

• planet

• moon

• sun

moon is _____________billion years old.

• 2.6

• 3.6

• 4.6

Neil Alden Armstrong was an _________________astronaut and engineer

• american

• spanish

• italian

The first artificial satellite launched into space from earth by the Soviet Union, in 1957.

• neil armstrong

• yuri gagarin

• sputnik 1

Laika, the dog, was sent to space by the soviet Union

• 1954

• 1956

• 1957

Distribution of water on Earth: oceans

• 1%

• 2%

• 97%

Desalination is the removal of ___________from sea water.

• sand

• mud

• salt