what causes an Earthquake

When there is an Earthquake there’s a reason.The Earthquake
happens because of the tectonic plates and tectonic plates are
all over the world. The tectonic plates look like jigsaw pieces .
There’s a rock that is inside the underground it is known as a
molten rock.When the magma rises up to the molten rock the
molten rock puts  pressure on the tectonic plate and so when
the molten rock puts pressure on the tectonic plates the tectonic
plates moves and when that happens it causes epicentres to
originate Earthquakes.When the magnitude is over six then it
would be very strong and if it is under six then it would be not
strong.But it is also about the depth.