Answer the following questions in brief.
1. Name the major components of the environment.
2. What is meant by Sima and Sial?
3. Mention the distribution of water in the Northern and Southern hemispheres.
4. Give the literal meaning of four spheres of environment.
5. What is the atmosphere composed of?
Answers
1. Major components of the environment include – Natural Components like, Land (Lithosphere), Water (Hydrosphere), Air (Atmosphere), Living things (Organism). Human made Components like, buildings, parks, bridge, road, industries etc.
2. Sial refers to the earth's crusts upper layer, it is made up of rocks abundant in silicate and aluminium based minerals. ... Sima is the earth's crusts lower layer and contains rocks with an abundance of magnesium silicate minerals, the word Sima is an amalgam of the first two letters of Magnesium and Silica.
3. Surface of Northern hemisphere is 60.7% water, compared with 80.9% water in the case of the Southern Hemisphere. Northern hemisphere contains 67.3% of Earth's land.
4. All the elements and properties in the earth's system are divided into four major subsystems. The scientific term for these subsystems is biophysical elements. There are four spheres of earth including hydrosphere, biosphere, lithosphere and atmosphere. Explanation: 2.0.
5. Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.
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