Magnetite element had guided the earlier navigators to keep them on right path.

Heat is energy in the process of being transferred from one object to another because of the temperature difference between them. After heat is transferred it is stored as “internal energy” which is the total energy stored in the molecules.

Symbiosis when the interaction is useful to both the populations.

A population is defined as a group of individuals in a species. Hence they can interbreed and include organisms in a geographical area. The total of all populations is called a universe.

Clouds form when moist, warm rising air cools and expands in the atmosphere. The water vapor in the air condenses to form tiny water droplets which are the basis of clouds.

The Sardar Sarovar Dam is a gravity dam on the Narmada river near Navagam, Gujarat in India. Four Indian states, Gujarat, Madhya Pradesh, Maharastra and Rajasthan, receive water and electricity supplied from the dam. The foundation stone of the project was laid out by Prime Minister Jawaharlal Nehru on 5 April 1961.

The park is home to a number of species of endangered mammals, including the snow leopard. Hemis National Park is India’s protected area inside the Palearctic ecozone, outside the Changthang Wildlife Sanctuary northeast of Hemis, and the proposed Tso Lhamo Cold Desert Conservation Area in North Sikkim.

The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the No. 4 nuclear reactor in the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian Soviet Socialist Republic.[1][2] It is considered the worst nuclear disaster in history and is one of only two nuclear energy disasters rated at seven—the maximum severity—on the International Nuclear Event Scale, the other being the 2011 Fukushima Daiichi nuclear disaster in Japan.

Higher the trophic level an organism occupies in the food chain higher will be the accumulation of non-biodegradable pesticide residues. This phenomenon is called as biomagnification.

The main energy source for the environment is Solar energy. Solar power harvests the energy of the sun through using collector panels to create conditions that can then be turned into a kind of power.