Origin of Earth
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Expansion of universe meansMarks:1
increase in space between the galaxies.
Explanation:The distance between the galaxies is found to be increasing and thereby, the universe is considered to be expanding.
The Big Bang Theory is also called theMarks:1
expanding universe theory.
Explanation:The most popular argument regarding the origin of the universe is the Big Bang Theory. It is also called expanding universe hypothesis. Edwin Hubble, in 1920, provided evidence that the universe is expanding. As time passes, galaxies move further and further apart.
From the earth's crust towards the core the density of the materialMarks:1
Explanation:Due to gradual increase in density the temperature inside has increased. As a result, the material inside started getting separated depending on their densities. This allowed heavier materials (like iron) to sink towards the centre of the earth and the lighter ones to move towards the surface.
The composition of the atmosphere was modified by the process ofMarks:1
Explanation:There are three stages in the evolution of the present atmosphere. The first stage is marked by the loss of primordial atmosphere. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis.
Process of differentiation meansMarks:1
separation of material into different layers.
It is through the process of differentiation that the earth forming material got separated into different layers. Starting from the surface to the central parts, we have layers like the crust, mantle, outer core and inner core. From the crust to the core, the density of the material increases.