Small pieces of rock that enter earth's atmosphere at speeds of 15 to 70 km/s and burn up are called
stars

meteors

meteorites

asteroids

a comet develops a coma because of
gravity

earth's atmosphere

the oort cloud

heat from the sun

What is the speed of a vehicle that travels 20 meters in 5 second

The pyramid has a square base that us inscribed in the circular base of the cone. draw an image of the composite shape of the base. 2) if the side length of the square base is 8 units long, what is the diameter of the circular base of the cone from the picture in number 1

According to the population pyramid, in 2000 china had about 120 million people in which age-group?