Earth
Q1. What is the general classification of the Earth's physical properties?
1. Lithosphere 2. Hydrosphre 3. Biosphere.
Q2. What is Lithosphere?
The rocky formation of the Earth, below and above the Earth's surface forming the top of Crust.
Q3. What is the depth upto which it is called the Lithosphere?
30 to 50 Kms below the landed area and upto 12 Kms on the sea beds.
Q4. Around the Mountains what is the extant of Lithosphere?
Thickest around mountains reaching upto 12 Kms on the sea beds.
Q5. How much percentage does the Lithosphere constitute of the Earth's Volume and Mass?
1% of Earth's volume and just about .4% of it's mass.
Q6. How much of the earth's surface area is covered by the Lithosphere and its constituents?
One third.
Q7. What is Hydrosphere?
The collective mass of water on the surface of a planet. On Earth it is two third of its surface area.
Q8. What is Biosphere?
All the living organisms - plants and animals - living on the surface of a planet.
Q9. Into how many layers the Earth has been classified?
Four. 1. Crust 2. Mantle 3. Outer Core and 4. Inner Core.
Q10. What is the top most layer of the Earth and what is its average depth?
Crust - 30 to 35 Kms on an average.
Q11. What is the second layer of the Earth and what is its average depth?
Mantle - 2900 Kms on an average.
Q12. What is the average depth of the outer core and what is its composition?
2100 Kms on an average. It is molten material. It has several layers. It is a shell of red hot rocks composed of silicate materials rich in Magnesium, and partially fluid.
Q13. What is inner core's depth and what is its composition?
13700 Kms on an average. Contains solid mass of Iron and nickel.
Q14. What is the important role the inner core has with Earth?
It accounts for Earth's magnetism.
Q15. What is Core?
The dense innermost part of the Earth with a diameter of about 6950 Kms. It is made up of Iron and Nickel.
Q16. What is Geosyncline?
Am enormous downward curve or inverted arch in the earth's crust.
Q17. What is Basin?
An extensive hollow or trough in the earth's crust. When occupied by an Ocean, it is ocean basin and if coal deposits are found it is coal basin.
Q18. What is Bog?
Area of water logged, spongy ground with rotting vegetation lying on the surface. Eventually the layer on top turns into a layer of Peat.
Q19. What is Corolis Force?
The force exerted by the Earth's rotation together with the force due to pressure gradient, which causes the wind to deflect.
Q20. What is Denudation?
General wearing away of Earth's surface by various natural agents like Sun, wind, rain, ice and sea which includes the transportation, shifting of the water from one place to another by natural agents and depositing them in another place.
Q21. In simple terms, what is the composition of Earth?
Soil, rocks, water, vegetation which includes forests, mountains, frozen areas and of course the living animals.
