Vocab. & Content Quiz Lesson 1 (i-Science Earth & Space)

What is the definition of an asteroid ?

• a small rocky object

• A large ball of ice.

• A medium sized snowball found on earth and space.

What is the largest object in our Solar System ?

• Jupiter

• Sun

• Moon

• Earth

What is the definition of a comet ?

• A small rocky object that orbits the earth.

• A large rocky object that orbits the sun.

• An object that is made of gas, dust and ice and moves around the sun in an oval-shaped orbit.

How long is an astronomical unit ?

• The distance from Mars to the Sun. So approximately 228 million kilometers.

• The distance from Neptune to the Sun. Which is approximately 4.5 billion kilometers.

• It is the distance found from the bottom of the ocean to the top of the sky. Approximately 1.5 million feet.

• The distance from Earth to the Sun. Which is approximately 150 million kilometers.

What is a revolution ?

• The time is takes the moon to travel around the earth.

• The time it takes for the 3 moons of Jupiter to travel around it's surface.

• The time it takes an object to travel around the sun once.

What is a period of rotation ?

• The time it takes an object to orbit around the sun.

• The time it takes an object to make one rotation.

• The time it takes an object to reverse course and complete one full revolution.

These planets are considered to be the inner planets of our solar system.

• Mercury, Venus and Earth

• Mercury, Venus, Earth and Mars

• Jupiter, Saturn, Uranus and Neptune

These planets are considered to be the outer planets of our solar system.

• Jupiter, Saturn, Uranus and Neptune

• Earth, Venus, Mercury and Mars

• Jupiter, Saturn and Uranus

What is the key difference between the outer and the inner planets ?

• They are all considered planets in our solar system.

• Outer planets are rocky and inner planets are mode from gas.

• The inner planets are made of rocky material and the outer planets are gaseous.