1.The size and shape of the crater and the amount of material excavated depends on factors such as the velocity and mass of the impacting body and the geology of the surface. ... Such a high-speed impact produces a crater that is approximately 20 times larger in diameter than the impacting object.
2..
It is called a biotic community, where animals and plants live together
3.Size and Frequency
About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an impressive fireball, and burns up before reaching the surface. Every 2,000 years or so, a meteoroid the size of a football field hits Earth and causes significant damage to the area.
