During time, air over the land becomes heated up by sun rays, it rises up and creates area of low pressure. Water of lake is not heated-up by sun rays so quickly. Evaporation of water from its surface also cools up the lake water. So, air over the surface of lake is cooler. It moves towards the landRead more
During time, air over the land becomes heated up by sun rays, it rises up and creates area of low pressure. Water of lake is not heated-up by sun rays so quickly. Evaporation of water from its surface also cools up the lake water. So, air over the surface of lake is cooler. It moves towards the land where low pressure exists. Therefore, during day time a cool breeze flows from lake to the near by
Water gets polluted from domestic wastes (loaded with detergents, faecal matter, etc.), fertilisers and pesticides from crop fields and industrial wastes (heavy metals, waste heat). (i) Fertilisers and domestic wastes cause eutrophication or increased organic loading and excessive growth of algae (aRead more
Water gets polluted from domestic wastes (loaded with detergents, faecal matter, etc.), fertilisers and pesticides
from crop fields and industrial wastes (heavy metals, waste heat).
(i) Fertilisers and domestic wastes cause eutrophication or increased organic loading and excessive growth of algae (algal bloom). This ultimately reduces oxygen available to aquatic animals (fish, molluscs) and kill them.
(ii) Domestic wastes also carry pathogens of a number of human diseases. Some of them can cause diseases of animals as well.
(iii) Pesticides and pollutants of industrial wastes directly harm the aquatic organisms and humans.
Rivers are formed from melting snow springs, and rain water flowing over land as run off. while passing through and over the rocks, the flowing water picks up minerals, silt and sand. These dissolved and suspended substances are carried by rivers to sea and make them available to marine organisms.
Rivers are formed from melting snow springs, and rain water flowing over land as run off. while passing through and over the rocks, the flowing water picks up minerals, silt and sand. These dissolved and suspended substances are carried by rivers to sea and make them available to marine organisms.
Earth's atmosphere is different from that of Venus and Mars. It contains only 0.03% carbon dioxide in addition to nitrogen, oxygen and water vapour. This is due to consistent presence of life on Earth (Gaia hypothesis). In comparison to Earth's atmosphere, atmosphere of Venus and Mars is rich in CO₂Read more
Earth’s atmosphere is different from that of Venus and Mars. It contains only 0.03% carbon dioxide in addition to nitrogen, oxygen and water vapour. This is due to consistent presence of life on Earth (Gaia hypothesis). In comparison to Earth’s atmosphere, atmosphere of Venus and Mars is rich in CO₂ (having 95 to 97% CO₂) and lifeless.
(l) Burning of fossil fuels in vehicles, thermal plants and industries. (ii) Particulate and gaseous emissions from industries, mining, processing and stone crushing.
(l) Burning of fossil fuels in vehicles, thermal plants and industries.
(ii) Particulate and gaseous emissions from industries, mining, processing and stone crushing.
During summer, if you go near the lake, you feel relief from heat. Why?
During time, air over the land becomes heated up by sun rays, it rises up and creates area of low pressure. Water of lake is not heated-up by sun rays so quickly. Evaporation of water from its surface also cools up the lake water. So, air over the surface of lake is cooler. It moves towards the landRead more
During time, air over the land becomes heated up by sun rays, it rises up and creates area of low pressure. Water of lake is not heated-up by sun rays so quickly. Evaporation of water from its surface also cools up the lake water. So, air over the surface of lake is cooler. It moves towards the land where low pressure exists. Therefore, during day time a cool breeze flows from lake to the near by
See lessHow is life of organisms living in water affected when water gets polluted?
Water gets polluted from domestic wastes (loaded with detergents, faecal matter, etc.), fertilisers and pesticides from crop fields and industrial wastes (heavy metals, waste heat). (i) Fertilisers and domestic wastes cause eutrophication or increased organic loading and excessive growth of algae (aRead more
Water gets polluted from domestic wastes (loaded with detergents, faecal matter, etc.), fertilisers and pesticides
See lessfrom crop fields and industrial wastes (heavy metals, waste heat).
(i) Fertilisers and domestic wastes cause eutrophication or increased organic loading and excessive growth of algae (algal bloom). This ultimately reduces oxygen available to aquatic animals (fish, molluscs) and kill them.
(ii) Domestic wastes also carry pathogens of a number of human diseases. Some of them can cause diseases of animals as well.
(iii) Pesticides and pollutants of industrial wastes directly harm the aquatic organisms and humans.
Rivers from land and minerals to sea water. Discuss how.
Rivers are formed from melting snow springs, and rain water flowing over land as run off. while passing through and over the rocks, the flowing water picks up minerals, silt and sand. These dissolved and suspended substances are carried by rivers to sea and make them available to marine organisms.
Rivers are formed from melting snow springs, and rain water flowing over land as run off. while passing through and over the rocks, the flowing water picks up minerals, silt and sand. These dissolved and suspended substances are carried by rivers to sea and make them available to marine organisms.
See lessHow is Earth’s atmosphere different from that of Venus and Mars?
Earth's atmosphere is different from that of Venus and Mars. It contains only 0.03% carbon dioxide in addition to nitrogen, oxygen and water vapour. This is due to consistent presence of life on Earth (Gaia hypothesis). In comparison to Earth's atmosphere, atmosphere of Venus and Mars is rich in CO₂Read more
Earth’s atmosphere is different from that of Venus and Mars. It contains only 0.03% carbon dioxide in addition to nitrogen, oxygen and water vapour. This is due to consistent presence of life on Earth (Gaia hypothesis). In comparison to Earth’s atmosphere, atmosphere of Venus and Mars is rich in CO₂ (having 95 to 97% CO₂) and lifeless.
See lessMention any two human activities which would be responsible for air pollution.
(l) Burning of fossil fuels in vehicles, thermal plants and industries. (ii) Particulate and gaseous emissions from industries, mining, processing and stone crushing.
(l) Burning of fossil fuels in vehicles, thermal plants and industries.
See less(ii) Particulate and gaseous emissions from industries, mining, processing and stone crushing.