Indicate whether the stated fact applies to continental or oceanic crust Very thick (30–60 km); Very dense (formed from e.g. basalt); Located beneath land masses and under shallow seas; Less dense (formed from e.g. granite).
Indicate whether the stated fact applies to continental or oceanic crust
Very thick (30–60 km);
Very dense (formed from e.g. basalt);
Located beneath land masses and under shallow seas;
Less dense (formed from e.g. granite).
The formation of the earth can be dated back to around 4.5 billion years ago. In the initial phases of its formation, the planet was a hot mass of hot gases and lava. However over the years, it cooled and evolved, by the continued action of physical, chemical and biological processes. In the process of evolution the first to form were the waterbodies, which formed by the process of condensation. Simultaneously, the atmosphere evolved, initially the atmosphere was devoid of oxygen and thus was reducing in nature, but by biological and chemical action oxygen was added to the atmosphere.
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