Geography.

Volcano

5

what is the volcano scale 

what is the Volcanic Explosivity Index

Earthquake

5

what is the earthquakes scale

what is The Richter scale

Tsunami

5

what is the tsunami scale

what is the tsunami magnitude scale 

Hurricane

5

what is the hurricanes scale 

what is Saffir Simpson scale

Tornado

5

what is the tornadoes scale 

what is enhance fujita scale

20

what is a tornado 

a condemnation of hot and cold winds