Available Answers

1. 1.

   Fill in the blanks:

   1. Never leave the kitchen (or bathroom) floor __________.
   2. __________ and __________ are the two factors of soil erosion.
   3. __________ is the topmost layer of the earth.
   4. Movable pulleys are used to lift __________.
   5. __________ was the first man-made satellite.
2. 2.

   Write 'T' for true or 'F' for false:

   1. Carbon-dioxide is a greenhouse gas.
   2. Landslides are caused due to heavy rainfall.
   3. Rain does not loosen the topsoil.
   4. Coal, wood and petroleum are the examples of fossil fuels.
   5. In case of big fires, call for the fire brigade.
3. 3.

   Match the following:

   1. Earthquake	a. Sputnik-1
   2. Cutting trees	b. Harbour wave
   3. Knife	c. Kinetic energy
   4. Ist artificial satellite	d. Seismograph
   5. Tsunami	e. Soil erosion
   6. Moving Ball	f. Wedge

    

4. 4.

   What are cyclones?

5. 5.

   Explain the Greenhouse effect.
6. 6.

   What are simple machines?