Easy
Normal
Hard
Very Hard
Impossible
100
Shaking of the ground
Earthquake
100
Fatal Ice Slide
Avalanche
100
A hurricane that functions off of geological causes
Tropical Storm 
100
A long severe snowstorm
Blizzard
100
Cavities in the ground that form when water erodes an underlying rock layer
Sinkhole
200
Deadly water storm formed overseas
Hurricane/Typhoon/Cyclone
200
A large body of water that moves fast across land
Tsunami
200
When tall rocks fatally slide downhill
Landslide
200
A temperature that is too cold, it freezes mammals and other organisms
Ice Storm
200
A tornado formed in the ocean
Waterspout
300
A uncontrolled fire that rages through the earthly region
Wildfire
300
Rising of the water to a specific height
Flood
300
When balls of ice fall through the sky
Hailstorm
300
Dissolved carbon dioxide suddenly erupts from deep lake waters, forming a gas cloud capable of suffocating wildlife, livestock, and humans
Limnic Eruption
300
A gas that is poisonous throughout the world
Killer Fog
400
No water resources during a period of time
Drought
400
A storm that is deadly enough to electrify people
Thunderstorms
400
A asteroid collides with the Earth
Impact Event
400
An intense burst of radiation coming from the release of magnetic energy associated with sunspots
Solar Flame
400
The gradual caving in of an area of land
Subsidence
500
A deadly wind storm that circulates as it moves a great distance
Tornado
500
A flood, due to heavy rain
Flash Flood
500
A period of time where the temperature is too high
Heat Wave
500
They can accompany heavy rains or follow droughts, earthquakes, or volcanic eruptions and slide downhill
Mudslide
500
occur when colonies of algae — simple plants that live in the sea and freshwater — grow out of control and produce toxic or harmful effects on people, fish, shellfish, marine mammals and birds
Algal Bloom
