The Earth is the third planet from the Sun in our solar system and is the only known planet to support life. It has a diverse environment, including oceans, mountains, forests, and deserts. The planet's surface is about 71% water, primarily in the form of oceans, which play a crucial role in regulating the climate. The Earth has a protective atmosphere composed mainly of nitrogen and oxygen, which helps sustain life by providing air to breathe and shielding the surface from harmful solar radiation. It also has a magnetic field that protects it from solar winds and cosmic radiation, making it a unique and vital part of the solar system.