Notes and Study material for Exams
Interior of the earth- composition and physical conditions Core, mantle, and crust are divisions based on composition. The crust makes up less than 1 percent of Earth by mass, consisting of oceanic crust and continental crust is often more felsic rock. The mantle is hot and represents about 68 percent of Earth’s … Read more
Most of the knowledge we have about Earth’s deep interior comes from the fact that seismic waves penetrate the Earth and are recorded on the other side. Earthquake ray paths and arrival times are more complex than illustrated in the animations, because velocity in the Earth does not simply increase with depth. Velocities generally … Read more
The origin of Earth is a topic of great interest to scientists and laypeople alike. There are many different theories about how Earth formed, and the evidence for each theory is constantly being debated. One of the most popular theories is that Earth formed from the accretion of dust and gas in the solar nebula. … Read more