Planetary geologists used meteorite dating and lunar rocks to determine that

a. the solar system is 4.6 billion years old

b. comets likely exist beyond the orbit of pluto

c. meteoroids originate from interplanetary debris that was gravitationally swept up by planets

d. asteroids are fragments of a broken planet that once orbited between mars and jupiter

The answer is A

Explanation:

Meteorite dating and lunar rocks are being used by planetary geologists in order to determine that the age of the solar system which is 4.6 billion years old. These meteorites are being tested in order to determine their span of existence

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.