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a)Mercury
- Venus
b)-The explosion of the stars led to the formation of a huge cloud of gases
(hydrogen and helium), dust and ice particles.
- This cloud whirled, cooled and condensed to a disc shape.
- The gravitational attraction within the materials increased cause the particles to
compact. Some particles broke from the edge of the disc and whirled.
- The compacted particles swirled faster towards the centre of the disc in different
directions. As they whirled they cooled or solidified to form the planets.
- This swirling caused particles to collide losing a little energy at a time.
- The middle of the spinning disc condensed to form the sun while the material
spinning around condensed into large chunks of materials called planetoids.
- The planetoids collided and coalesced into large bodies called planets.
- The earth is one of the planets.
- The centre of the disc formed the sun.
c)-The earth experiences the force of gravity pulling towards the centre which
creates a rounding effect on its shape.
- The North and South poles experience centripetal force which constantly pull
towards each other causing the flattening at the poles.
- At the equator the earth experiences the centrifugal force which causes the
bulge.
d)It causes the occurrence of day and night /apparent movement of the sun from
East to West.
- It causes difference in time between places over the earth's surface.
- It causes deflection of winds / ocean currents.
- It causes differences in atmospheric pressure on the surface of the earth.
- It causes ocean/sea tides
e)It is divided into two layers - sial (continental crust) and sima (oceanic crust).
- The sial rests on the sima
- The sial contains mainly silica and aluminium.
- The sima contains silica, magnesium and iron.
- The sial is lighter/has a density of 2.65 to 2.70 gm per cc.
- The sial has mainly granitic rocks.
- The sima has basaltic rocks.
- The sima is heavier/has a density of 2.7 to 3.0 g/cc
- The sima is fairly flexible
-It's rocks are generally brittle/solid.
- The earth's crust extends between 6 to 80 km
Githiari answered the question on September 15, 2017 at 04:00
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