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What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

Why does ice float?

• As water freezes, the molecules spread out decreasing its density.

• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

• As water freezes, air gets trapped making it more dense

• As water freezes, it takes up more oxygen from the atmosphere, causing it to be more dense

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive

The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form

• less polar
• more polar
• less dense
• more dense

Which lists some effects of El Niño?

• warmer temperatures and less rain

• cooler temperatures and less rain

• cooler temperatures and more rai

• warmer temperatures and more rain

Cooler Pacific ocean and less rain on the western coasts of South America and North America are impacts of which of the following weather phenomena?

• El Niño

• La Niña

• the Gulf Stream

• The Jet Stream

Which of the following best explains the relationship between an El Niño event and the tradewinds?

• When the tradewinds increase in strength, El Niño occurs.

• When the tradewinds decrease in strength, El Niño occurs.

• Scientists do no understand what causes El Niño to occurs.

• When the tradewinds blow west to east, El Niño occurs.

Wind is caused by

• the Coriolis Effect

• the tilt of the Earth on it's axis

• uneven heating of the Earth's surface

El Niño happens when the

• ocean temperatures stay the same

• trade winds are stronger

• trade winds are weakened

• ocean temperatures are colder than normal