EVERYDAY SCIENCE

Detailed explanation-1: -The abyssal zone remains in perpetual darkness at a depth of 4, 000 to 6, 000 metres (13, 000 to 20, 000 ft). The only organisms that inhabit this zone are chemotrophs and predators that can withstand immense pressures, sometimes as high as 76 megapascals (750 atm; 11, 000 psi).

Detailed explanation-2: -The aphotic zone is the deepest part of the ocean and has no light. It is below 3000 ft and is also known as the midnight zone. It is filled with invertebrates and life forms that can live under extreme pressure, such as fish that glow in the dark and the coelacanth.

Detailed explanation-3: -There are five major types of biomes: aquatic, grassland, forest, desert, and tundra, though some of these biomes can be further divided into more specific categories, such as freshwater, marine, savanna, tropical rainforest, temperate rainforest, and taiga. Aquatic biomes include both freshwater and marine biomes.

Detailed explanation-4: -The forest biome most at risk from human development is the rainforest, which has undergone significant deforestation due to logging, power generation, the expansion of agriculture and the paper industry. This massive loss of trees has already contributed to global warming.

Detailed explanation-5: -Estuaries: Where the Ocean Meets Fresh Water Estuaries are biomes that occur where a source of fresh water, such as a river, meets the ocean. Therefore, both fresh water and salt water are found in the same vicinity; mixing results in a diluted (brackish) saltwater.