is earth made of?
Our Earth is unique among all planets. It is huge ball
with plenty of water and some land masses. It is covered by a layer of air. It
is the planet that has right combination of air, water, land etc. to sustain
Layers of Earth
Earth is made of three main layers. Outer layer of the
Earth is called Crust. Crust is of two types: continental crust (below
the land and is thicker) and the Oceanic crust (below the ocean and is
thinner).We live on solid outer layer of the earth. Under the crust lies the mantle.
It is made up of hot molten rock. Beneath the mantle is core. This is
the deepest and hottest layer of the earth.
What Earth looks like?
Only our planet earth support life. It has nearly 70%
water and 30% land. It is beautiful planet and it looks bluish because of
ocean, brownish because of land, white because of cloud covering, when seen
from space. There are 7 very large landmasses on Earth called continents.
Different land forms are found on the earth such as mountain, valley and plains.
A large elevated earth surface is called mountain. Hill is a raised area of land but not
high and steep as mountain. Low land between hills and mountain are called
valley. Large area of flat land is called plains.
We can see rocks in different shapes, sizes and in
colors on earth as they are made up of different minerals. Mineral is a
solid naturally occurring inorganic/lifeless material. Soil is important
resource on the earth that supports plant life and plant provide food for
animals and people.
Soil is formed when rock are broken naturally by means
like water, wind, plant etc. This breaking down of rock by natural agents is
called weathering. Washing and blowing away of top layer of soil from
one place to another is called soil erosion. Weathering and frequent
soil erosion results in change in land forms.
on land and in ocean
All living beings need water to survive. Water on land
is found in the form of ponds, lakes and rivers. All these are called fresh
water bodies. Water found in ocean is salty. Many plants and animals live in
Our earth is surrounded by air. Air is mixture of many
gases. We cannot see air with our eyes but we can feel it.
Example: We can feel cool
breeze. We breathe in air to stay alive.