English
Learn the lesson ‘World of water’ for an oral review on
21-03-17.
Science
Write
the following content given below in your science note book. Also draw diagrams
for the same as shown in class. Submit the same on Tuesday, 21/3/17.
Study
the underlined words for a dictation on the following day,(20/3/17)
Transpiration- The process of evaporation
from plants is called transpiration.
Precipitation- When the water
in the clouds gets too heavy, the water falls back to the earth in the form of rain, snow or
hail.
Water
pollution is when waste, chemicals,
or other particles cause a body of water (i.e. rivers, oceans, lakes) to
become harmful to the fish, animals and humans that need water to survive.
There
are two causes of water pollution:
1.
Natural
causes of water pollution-like volcanoes, algae blooms, animal waste, and silt
from storms and floods
2.
Human
causes of water pollution-sewage, pesticides and fertilizers from farms, waste
water and chemicals from factories, silt from construction sites, and
littering.
S.St
Continue these notes in your S.St. notebook and submit on
Monday 20/3/2017.
Q. What is Biosphere?
Ans. The Biosphere is the narrow zone where we find land,
water and air together, which contains all forms of life.
Q. What is Hydrosphere?
Ans. The large area of earth that is covered by water in all
its forms ( ice, water and water vapour) is called Hydrosphere.
Q. What are the different layers of atmosphere?
Ans. The atmosphere is made up of 5 layers. They are:-
1. Troposphere - The troposphere
is the layer closest to the Earth. It is this layer that contains most of the
water vapour.
2. Stratosphere - The stratosphere is the second
layer of air above the Earth’s surface. It is here that we find the ozone
layer.
3. Mesosphere - Beyond the stratosphere the air is
very thin and cold. This area is known as the mesosphere.
4. Thermosphere - The thermosphere is the fourth
layer in the atmosphere. Space shuttles fly in this area.
5. Exosphere - The exosphere is a layer where the
atmosphere merges into space. Satellites are stationed in this area.
