91影视

An element is a substance with the same number of protons in all of its atoms, or the same atomic number in all of its atoms.

(a). The heat from radioactive decay and meteor impacts elevated the Earth's temperature to${10}^4\mathrm{K}$

Differentiation is the separation of substances based on their physical and chemical characteristics. Density is the physical attribute of a substance that is primarily responsible for this process. The lighter atoms formed parts of our planet, while gaseous elements like hydrogen and helium were blasted into space.

Earth is made up of layers and is made up of:

鈥�core dense (average density $10-15{\mathrm{gcm}}^{-3}$).

鈥�thick homogeneous mantle-average density $4-6{\mathrm{gcm}}^{-3}$.

thin heterogeneous crust, $2.8{\mathrm{gmcm}}^{-3}$average density.

We can see how the heavier substances "sink" to the centre, resulting in a thick core.

Therefore, density is the physical property.