By Qingjie Bao

 The ecology is the study of the interactions of living things with each other and physical environment.

 The biosphere is the global sum of all ecosystems. It can also be called the zone of life on Earth, a closed (apart from solar and cosmic radiation) and self-regulating system. The biosphere is the global ecological system integrating all living beings and their relationships.

 The biosphere is postulated to have evolved, beginning through a process of biogenesis or biopoesis, at least some 3.5 billion years ago.

 Biologist : The person who study humans, plants, animals, and the environments in which they live.

 The atmosphere is a layer of gases that may surround a material body of sufficient mass. And that is held in place by the gravity of the body.

 The atmosphere may be retained for a longer duration, if the gravity is high and the atmosphere's temperature is low.

 Meteorologist : The scientist who study of the earth's atmosphere and the weather which occur in it.

 The ecosphere is an imaginary shell of space surrounding stars where conditions are such that life might survive.

 The ecosphere can refer to the Earth's spheres, a planetary ecosystem consisting of the atmosphere, the geosphere (lithosphere), the hydrosphere, and the biosphere.

 Ecologist : The scientific who study the relations that living organisms have with respect to each other and their natural environment.

 The hydrosphere is the liquid water component of the Earth. It includes the oceans, seas, lakes, ponds, rivers and streams. The hydrosphere covers about 70% of the surface of the Earth and is the home for many plants and animals.

 The Hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet.

 Hydrologist : The scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

 The lithosphere is the outer solid part of the earth, including the crust and uppermost mantle. The lithosphere is about 100 km thick.

 On Earth, it comprises the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater.

 Geologist : The scientist who study the solid and liquid matter that constitutes the Earth as well as the processes and history that has shaped it.

 We know the Biosphere, Atmosphere, Ecosphere, Hydrosphere, and Lithosphere are important part of Earth. So we need to save our Earth.