The Earth, our planet, is composed by three kinds of materials distributed in layers. These layers can be gaseous, solid or liquid.
It forms the atmosphere that surrounds the planet. The atmosphere has several zones defined as troposphere, stratosphere, mesosphere and ionosphere.
It’s formed by the crust, the mantle and the core.
It is also called Hydrosphere. It’s the mass of water found on, under and all over the surface of the Earth.