It measures the strength of an earthquake (magnitude). Usually measures 1-10 but can be higher or lower. It is objective and isn't based on what people think.
What is the Mercalli scale?
It measures the damage done by an earthquake. It is measured from 1-8 (I-VIII) and is subjective as it's based on what people think.
What is a destructive plate margin?
A destructive plate margin is a boundary where two tectonic plates (oceanic and continental) collide, resulting in the destruction and subduction of one plate beneath the other. Volcanoes and earthquakes form / take place here.
What is a conservative plate margin?
A conservative plate margin is a boundary where two tectonic plates slidepast each other horizontally without creating or destroying crust. Earthquakes take place here.
What is constructive plate margin?
Where two plates are moving apart causing new magma to reach the surface through the gap. This causes volcanoes to form.
What is a collision margin?
Where 2 continental plates collide, resulting in mountainranges to form. For example, the Himalayas in Asia.