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Lets say I have two rocks, how do I know which one is older?
Well there are many ways to determine the age of rocks.
What are some of those methods?
One method is the law of superposition. This law states that layers of rock above another layer of rock are younger than the layer below it.
Are there anymore methods?
Indeed there are Laura, another common method to identify the age of rocks is radiometric dating. Radiometric dating uses the half lifes of radioactive isotopes to determine the age of a sample, not just rocks.
How are we able to find the composition of solar system objects?
Well after finding that of our own planet we can infer that other planets must have similar elements since they are relatively close and formed from the same solar nebula.
We also able to find the composition of planets we have visited using soil samples from manned missions or rovers.
Why does the moon have so many more craters then we do?
Thanks to telescopes and rovers we are able to observe and measure craters on not only the moon but other celestial bodies as well. As I mentioned earlier, due to Earth's plate tectonics the crust is constantly changing and therefore the vast majority of craters on Earth disappear.
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