Question

question 1
although _ of earths surface is water, only _ is freshwater.
a 50%; 2%
b 55%; 8%%
c 63%; 5%
d 70%; 1%
e 82%; 3%

question 2
the energy requiring process by which liquid water becomes water vapor (a gas) is:
a sublimation
b evaporation
c condensation
d convection
e diffusion

Explanation:

• For Question 1:
• Approximately 70% of Earth's surface is covered by water.
• Only about 1% of this water is freshwater available for human use (after accounting for ice - caps, glaciers, etc.).
• For Question 2:
• Evaporation is the process where liquid water changes to water vapor (gas) and it requires energy (heat).
• Sublimation is the direct change from solid to gas.
• Condensation is the change from gas to liquid.
• Convection is a mode of heat transfer.
• Diffusion is the movement of particles from high to low concentration.

Answer:

• Question 1: D. 70%; 1%
• Question 2: B. Evaporation