What causes an earthquake?

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes seismic waves to be released, causing the ground to shake.

Earthquakes are caused by movement in the tectonic plates(known as plate tectonics).

This usually happens in plate boundaries(where one plate meets another), due to the pressure that builds up as the plates try to move, since tectonic plates are constantly moving

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.