The Thermosphere feels very cold to us because of its low Thermal Energy. There are very few particles in the Thermosphere, so even if they were very, very<span> hot, it would feel cold.</span>
If the distance from the ridge increases, the age of rocks also increases.
Scientists<span> can tell by observing the seismic waves that are recorded all over the surface of the </span>earth<span> from distant earthquakes. The seismic waves are reflected (bounced off) </span>layers<span> of different density, and they are refracted (bent) when they enter </span>layers<span> of different density.</span>