שאלה | The water we use usually comes from either surface water or aquifers and not from the vadose zone. Why then it is so important to learn about the vadose zone? Mark the most correct answer.

The water we use usually comes from either surface water or aquifers and not from the vadose zone. Why then it is so important to learn about the vadose zone? Mark the most correct answer.

		Since water from the land surface must cross the vadose zone to reach the aquifer, the characteristics of and reactions in the vadose zone can have a dramatic effect on the quantity and quality of the groundwater.
		The vadose zone acts as a filter that cleans the surface water, and without a thick vadose zone, this water cannot be used for drinking.
		Most water pollution originates in the vadose zone; thus, in order to prevent the pollution from reaching the aquifers and the surface water, we must treat it while it is in the vadose zone.
		The unique multiphase system of the vadose zone gives scientists a rare opportunity to study an environment with conditions that resemble the conditions on Mars.