List any three hazards of nuclear waste. How does the disposal of nuclear waste pose a problem for the plant and animal life?

(a) Which property of water in ocean enables it to act as a storehouse of solar energy?

(b) List three forms in which energy from ocean can be harnessed?

(c) How are they different from each other?

State the meaning of the term “hot spot” in the context of earth crust. Write one advantage and one limitation of utilizing energy obtained from the hot spots.

Aditya suggests his family to install a solar water heater at their residence. But some of the family members were in favour of installing an electric geyser. Ultimately the family got water heater installed.

(a) Which according to you was correct? Give two reasons in support of your answer.

(b) Mention two possible changes in the thinking of the family members because of the arguments given by Aditya.

Slippery surface between colliding tectonic plates resulted in a huge release of energy into the sea and this resulted in massive tsunami. The 2011 devastating tsunami rolled over many parts of Japan and caused huge damages. The disaster also caused the three reactors at Fukushima nuclear power plant to melt down which released dangerous harmful radiations into the surrounding areas and led to national power shortage.

(a) What could be the reason for damage in nuclear reactors?

(b) How did it affect the environment and the people?

(c) Do you think nuclear energy is a future source of energy?