revision ( ch-8,16,21)

26.11.2015 Revision( Ch-8, 16, 21)

Q1. What are the main components of environment?

Q2. Diffrentiate between weather and climate.

Q3. Name the different ways of sending messages through post offices.

Q4. What are three main factors on which the climate of a place depends?

Q5. How are trees useful to the environment?

Q6. Fill in the blanks:-

a) The fumes released by factories pollutes the environment.

b) The winter season lasts from October to february or march.

c)Hot and dry winds that carry dust and sand are called loo.

d)The farther the place from the Equator the cooler the place is.

e) In olden days, people sent messages through pigeons.

f) Telivison can be easily watched and live programs are shown through satellites.