Discuss the importance of lithosphere, hydrosphere and atmosphere
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The hydrosphere, lithosphere, atmosphere, biosphere, and continental shelf are key to sustaining Earth as we know it. The hydrosphere sustains a variety of lifeforms and plays a major role in regulating the atmosphere and surrounding ecosystems. ... The biosphere is as important as life itself because it is all of life
Answer:
importance of lithosphere
Lithosphere is the topmost crust of the earth on which stand our continents and ocean basins. The lithosphere has a thickness between 35to 50 km in the continental regions but becomes thin between 6 and 12 km under ocean beds. In the high mountain region its thickness is estimated about 60km. Lithosphere provide us forests, grasslands for grazing land for agriculture and human settlements and also rich source of minerals.
The lithosphere contains different types of rocks such as the igneous, sedimentary and metamorphic rocks, it helps to provide the necessary nutrients required to plants. The mantle, which lies between the core and the crust, consists of molten rock, called magma which moves continuously because of convection currents.
importance of hydrosphere
We rarely think about the role of the planet that keeps us alive and takes the hydrosphere for granted. The major importance of the hydrosphere is that water sustains various life forms and plays an important role in ecosystems and regulating the atmosphere. Hydrosphere covers all water present on the Earth’s surface. It involves saltwater, freshwater, and frozen water along with groundwater and water in the lower levels of the atmosphere. The following are the functions of a hydrosphere.
Water is the most important part of living cells
Every cell in a living organism is built up of about 75% of water, hence allows the cell to function appropriately. Cells would not able to carry out normal functions and life cannot exist without water.
Human needs
Humans use water in many ways. Drinking water is the most obvious use, but it is also used for domestic purposes like washing and cleaning and in industries. Water is also utilized in generating electricity through hydropower.
Water provides habitat
Hydrosphere provides a place for many plants and animals to live in. Many gasses like CO2, O2, nutrients like ammonium and nitrite(NO–2) as well as other ions are dissolved in water. The presence of these substances is essential for life to exist in water.
Regulate Climate
The water’s specific heat is its unique characteristics. This indicates that water takes a lot of time to heat up and a lot of time cool down. It helps in regulating temperatures on earth as they stay in a range that is acceptable for life on earth to exist.
These are only a few of the functions that water plays on the planet. Many functions relate it to chemistry and methods in which it dissolves substances.
importance of atmosphere
The atmosphere is a mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth. High above the planet, the atmosphere becomes thinner until it gradually reaches space. The atmosphere is an important part of what makes Earth livable. It blocks some of the Sun’s dangerous rays from reaching Earth. It traps heat, making Earth a comfortable temperature. And the oxygen within our atmosphere is essential for life.
Layers of the Earth’s Atmosphere
The troposphere is the first layer above the surface and contains half of the Earth’s atmosphere. Weather occurs in this layer.
Many jet aircraft fly in the stratosphere because it is very stable. Also, the ozone layer absorbs harmful rays from the Sun.
Meteors or rock fragments burn up in the mesosphere.
The thermosphere is a layer with auroras. It is also where the space shuttle orbits.
The atmosphere merges into space in the extremely thin exosphere. This is the upper limit of our atmosphere.
One of the most important benefits the atmosphere provides is maintaining the Earth’s temperature. On the moon, which has no protective atmosphere, temperatures can range from 121 degrees Celsius in the sun (250 degrees Fahrenheit) to negative 157 degrees Celsius in the shade (negative 250 degrees Fahrenheit). The atmosphere serves as a protective shield against radiation and cosmic rays. The atmosphere also serves an important purpose as a medium for the movement of water. Vapour evaporates out of oceans, condenses as it cools and falls as rain, providing life-giving moisture to otherwise dry areas of the continents.
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