{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

331 zoning of the solid earth the molten earth that

Info icon This preview shows pages 16–22. Sign up to view the full content.

View Full Document Right Arrow Icon
3.3.1 Zoning of the Solid Earth The molten earth that resulted during Iron catastrophe settled such that lighter particles like silicon etc floated, cooled and formed the outer crust and mantle. The heavier particles like iron etc settled beneath the crust forming the core. Hence, iron
Image of page 16

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
- 17 - formed 3 1 of the earth mass (Fig.1) Water containing particle in the earth went through chemical changes and released water which settled on the surface to form the ocean. Gas containing particles also went through chemical changes releasing gasses to form the lightest atmosphere which is located on top of the liquid and parts of the earth. 3.4 Self Assessment Exercise (a) The earth is formed from the remnant particles of what heavily bodies, according to the hot origin theory? (b) List the source of the heat that caused iron catastrophe. (c) Which part of the solid earth is densest? (d) Why is the ocean located on the surface of the earth? Crust (Dense) Mantle (Denser) Core (Densest) Fig.1: Simplified Model of the Solid Earth
Image of page 17
- 18 - 4.0 Conclusion Earth originated from preexisting entities in the universe, be it particles or parts of heavenly bodies. The internal and external parts of the earth are in a regular zone that conformed to scientific reasoning. 5.0 Summary I this unit you have learnt the following: (i) Cold and hot origin theories of the earth (ii) The characteristics of the earth that suit the development of life on it. (iii) Iron catastrophe was caused by heat from particle accretion, gravitational pulls and radioactive decay, the aftermath of which is earth zoning. (iv) The solid earth has three basic sections V 13 :crust, mantle and core (v) Over 33% of the earth’s mass is iron 6.0 Tutor Marked Assignment (1) List 5 conditions that make the planet earth a congenial place for living things to survive. (2) Explain the effects, if the distance of the earth from the sun were less or more than what it is now. (3) Justify the formations of ocean and atmosphere above the solid earth. (4) Mention one weakness each of cold and hot origin theories of the earth.
Image of page 18

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon