Available Answers

1. 1.

   State True or False.

   1. The main causes of air pollution are human activities like construction, deforestation etc.
   2. Trees are very helpful in reducing the effect of greenhouse gases.
   3. Earthquakes are caused due to excessive heat and rain.
   4. Chalk is made from limestone.
   5. Silver, gold, copper and zinc are non-metallic minerals.
2. 2.

   Fill in the blanks.

   1. The _______________ of coal and petroleum is necessary because they are limited.
   2. Both igneous and _______________ rocks can be changed into _______________ rocks.
   3. Volcanoes in which erupting activities are completely stopped, are called _______________ volcanoes.
   4. _______________ pollution makes soil _______________.
   5. The _______________ is the surroundings in which we live.
3. 3.

   Unscramble the jumbled letters to define the followings.

   1. Building units of all rocks.
      NIMARESL
   2. Traces of ancient plant and animals in the layer of sedimentary rocks.
      SOFSLIS
   3. Crack in the form of conical mountain in the earth's surface that throws out lava.
      LOVONCA
   4. The point of disturbance on the earth's surface directly above the focus.
      PIERENCTE
   5. Japanese term for huge ocean waves.
      STUANIM
4. 4.

   An eco-friendly activity is one that does not harm the environment. We have many eco-friendly substitutes for the products that disturb the environment. Match thee following products with their eco-friendly substitutes.

   products	Substitutes
   1. Petrol/diesel	a. jute/paper
   2. Electric energy	b. CNG
   3. Polythene	c. public transport
   4. Wrapping sheets	d. solar energy
   5. Personal transport	e. recycled paper