Natural disasters and Conditional 1 and 2

.....is a disaster closely related to an avalanche, but instead of 

occurring with snow, it occurs involving actual elements of the 

ground, including rocks, trees, parts of houses etc.

… is a natural disaster resulting from a thunderstorm. It is a violent, 

rotating column of air, which can blow at speeds between 50 and 

48 km/h and possibly higher. It can occur one at a time or can occur 

along lines occupying large areas.

 … is the point in which a volcano is active and releases its power, 

and the eruptions come in many forms.

... is an uncontrolled fire burning in wildland areas. Common causes 

include lightning and drought but they may also be started by human 

carelessness.

...are the result of prolonged rainfall from a storm, rapid melting of 

large amounts of snow, or rivers which rise up their levels of wate

...a phenomenon that results from a sudden release of stored 

energy that radiates seismic waves. It shows itself by a shaking of 

the ground.

 … is a slide of a large snow (or rock) mass down a mountainside. It is 

one of the major dangers faced in the mountains in winter.

If we ... bicycles, we would have less air pollution.

If we planted new trees, rainforests ... disappear.

If we ... in London, I would speak English.

If she passed the exam, she ... be able to enter university.

We ... come to lunch if we ..time.