The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...

Over time, Earth's interior—which is made mostly of silicate rocks and metals—differentiated into four layers. At the ... the seafloor is thinner—about three miles thick—and denser.

The rocks on Earth are constantly changing due to many different processes. There are three main types of rock ... Over time, the layers are compressed and glued together.Metamorphic rocks ...

Earth Day is on Tuesday, April 22, this year. The annual observation is set aside to increase awareness around environmental issues like climate change, pollution, endangered species and other ...