unit 5-6

What is an avalanche also called as?

• Snowslide

• 
  Flood

• Bed layer

• Glacier

what is an avalanche?

• Something that is cause by air pollution and acid rain

• Snow on a mountain

• Winter disaster

• A phenomenon of nature

Which is NOT correct?

• An avalanche is a rapid flow of snow down a slope

• All avalanches have a trigger, a starting point, a slide path and run out zone.

• the trigger of an avalanche is only natural and causes the sudden rupture of the snow pack

• The debris deposit is the accumulated mass of the snow avalanche once it has come to rest and may contain ice, soil, rocks and vegetation

Avalanches are sometimes ..... by loud sounds.

• 
  triggered

• 
  stopped

• 
  calmed

• relaxed

Experts say that if you find yourself buried under an avalanche, you should dig the snow away from your head in order to make a ..... area for yourself.

• sneezing

• breathing

• heating

• windy

How can triggering explosives help prevent avalanches?

• By completely leveling the slopes of mountains

• By melting all the snow on mountain slides

• By preventing huge snowpacks from forming

• By destroying trees and rocks that can hurt people in avalanches

Why is ethanol a biofuel?

• It is not a biofuel

• It contains sugar cane, sugar beet and molasses, starch and forest products

• It is a fossil Fuel

• It contains Glycerin separated from fat and vegetable oil.

Which one of these is correct about the disadvantages of biofuels?

• It only requires a little quantity

• 
  It doesn't depend on agriculture

• It is expensive

• More power output

What are Biofuels?

• Fuel produced very slowly by the geological processes

• Derived immediately from living organisms

• Burning dead organisms and using it as energy

• 
  Burning dead organisms and using it as fuel

Biofuel is...?

• Energy that comes from harnessing the movement of the air

• Energy that comes from the Sun

• Fuel from plant material

• A source of renewable energy, such as solar, wind, or geothermal energy