OUR PLANET

• We live on the planet earth. On our planet there are high mountains and hot deserts, clouds, huge oceans and freezing cold regions and much more elements…. All of them are organized in different parts as known.. atmosphere, lithosphere and hydrosphere.

ATMOSPHERE: air LITHOSPHERE: soil BiosphereHYDROSPHERE: water

“The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, hydrosphere and atmosphere“

In simple words biosphere is the zone of life on earth.

ATMOSPHERE• The atmosphere is made up of many gases, including

nitrogen and oxygen. We need to breathe oxygen to stay alive. High up in the atmosphere, a gas called ozone provides a barrier to harmful radiation from the sun.

• The atmosphere is made up of several layers. Most of the air we breathe is in the bottom layer called the troposphere. This extends for 12 miles (20 kms) above the Earth´s surface. The farthest layer from Earth is the exosphere, which has very little gas.Also it has the stratosphere (ozone layer) and the ionosphere (reflect the ionized energy of the sun. )

Troposphere: Here we find most of the air we breathe. This extend for 20 kms above the Earth surface

LITHOSPHERE:• It´s the solid part of the Earth, part of

it , it´s underwater and the other is where we live. the Earth is made up of four layers: the crust, mantle , outer core and inner core.

the crust: Is the Earth skin- like the peel of an orange. Beneath the crust is a thick layer, called the mantle, made of mostly solid rock which subjected to enough heat and pressure.

• The Earth crust is cracked into huge pieces that fit together like a giant puzzle. These pieces are called plates.

The oceans and continents (landmasses) lie on the plates, with float on the mantle. The plates that make up the Earth´s crust slowly move and rub against each other. Though they only move a few inches each year, their buckling can cause volcanoes and earthquakes.

• The crust is where living things are.

• The mantle:Is so hot that the rocks have melted, although not all the rocks are melted all the time.

• Near the centre of the Earth are two layers of the planet´s core, which are made of metal. – The outer core is made of red –hot, molten

iron, nickel, and sulphur. – The inner core is made of iron, nickel and

sulphur. Although it is solid, this is the hottest part of the planet.

HYDROSPHERE.

• It´s the liquid part of the planet Earth and it is the biggest part of it, but even when the planet has a lot of water not all it´s useful for most of the living things because the 94 % is salty water.

• The hydrosphere is often called the "water sphere" as it includes all the earth's water found in the oceans, glaciers, streams, lakes, the soil, groundwater, and in the air. The hydrosphere interacts with, and is influenced by, all the other earth spheres. The water of the hydrosphere is distributed among several different stores found in the other spheres. Water is held in oceans, lakes and streams at the surface of the earth.

• Water is found in vapor, liquid and solid states in the atmosphere. The biosphere serves as an interface between the spheres enabling  water to move between the hydrosphere, lithosphere and atmosphere as is accomplished by plant transpiration. The hydrologic cycle traces the movement of water and energy between these various stores and spheres.