4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____. (1 point)

stars
meteors
meteorites
asteroids

http://www.universetoday.com/36398/what-is-the-difference-between-asteroids-and-meteorites/

Meteors

derp its a meteor

so what is the answer?

To find the correct answer, we need to identify the small pieces of rock that enter Earth's atmosphere at high speeds and burn up. Let's go through the options:

1. Stars: Stars are massive celestial bodies that emit light and heat due to nuclear reactions. They do not enter Earth's atmosphere at high speeds and burn up.

2. Meteors: Meteors are the correct answer. They are small pieces of rock or metal that enter Earth's atmosphere at high speeds, often resulting in a glowing trail of light. They burn up due to the intense heat generated from the friction with the atmosphere.

3. Meteorites: Meteorites are remnants of meteors that survive the journey through the atmosphere and reach the Earth's surface. While they are closely related to meteors, they are not the correct answer to the question.

4. Asteroids: Asteroids are large chunks of rock that orbit the sun. They are not specifically small pieces of rock that enter Earth's atmosphere and burn up.

So, the answer to the question is meteors.