1, Comparing the composition of the crust to other bodies in the solar system
2. By studying things from Earths layers that have been pushed up through the cracks of the crust.
3.By measuring diffrent kinds of vibration from earthquakes
3.By doing laboratory expirements
I HOPE THIS HELPS YOUU!!!!!
B. Sperm and egg cells are made during meiosis and question 2 is B. Sperm
