Flash Cards Vocabulary Test-Unit 8-Practice

The gasses surrounding Earth and other planets are called ________.

• stratosphere
• atmosphere
• troposphere
• exosphere

Rounded by gravity, orbiting the Sun, but ______________ has not cleared its

orbit of debris.

• a planet
• a star
• a comet
• a dwarf planet

The force of attraction between objects that is based on mass and the distance between them.

• Nuclear force
• Frictional force
• Electromagnetic force
• Gravitational force

The four planets nearest to the Sun can be classified as ___________________.

• gas giants
• dwarf planets
• terrestrial planets
• ice giants

Gas Giants are planets with deep, massive atmospheres such as Jupiter.

• Earth is a Gas Giant.
• Jupiter is a Gas Giant.
• Mars is a Gas Giant.
• Venus is a Gas Giant.

Gravitational force increases as the mass of an object increases.

• Newton's Law of Universal Gravity

• Kepler's Laws of Planetary Motion

• Einstein's Theory of General Relativity

• Hubble's Law of Cosmic Expansion

An object made of rock, ice, dust and gas that revolves around the Sun.

• Meteorite
• Asteroid
• Planet
• Comet

Needed to keep an object moving in a circular path.

• Centripetal force
• Gravitational force
• Frictional force
• Magnetic force