SOLAR SYSTEM

Detailed explanation-1: -These planetesimal collisions cause the planetesimals to increase in size. Planetesimals eventually become planets after they are large enough to have a solid core and orbit. The planetesimal hypothesis suggests that planets form through the accretion of particles in the same orbit through collisions.

Detailed explanation-2: -Earth got its water from cometary debris striking the earth over millions of years. Also, the Iron in the center of the earth slowly sank there while the earth was forming during the early days when asteroids, and other objects kept the earths surface a molten, boiling surface.

Detailed explanation-3: -In some of the most powerful collisions, the energy from the impact heated the planetesimals so much that certain regions began to melt. Evidence of all these processes can be seen in meteorites.

Detailed explanation-4: -Earth and the other planets in the solar system first began to take shape as countless smaller bodies collided and clumped together. The energy of those violent collisions transformed into heat energy. As the early Earth grew bigger, gravity began pulling matter toward the center.