Question

question 7 (1 point)
buffer strips help protect water quality by:
o a filtering runoff before it enters water bodies
o b making soil more acidic
o c adding more salt to water
o d increasing the temperature of streams

question 8 (1 point)
an example of a water contaminant that comes from industry is:
o a rainwater
o b chlorophyll
o c heavy metals
o d clean sand

question 9 (1 point)
what can overuse of groundwater for irrigation cause?
o a rising water tables
o b lowering of water tables
o c cleaner water
o d more rainfall

Explanation:

Question 7

Buffer strips are vegetated areas. They act as a filter. Runoff from fields or other areas passes through them. The plants and soil in buffer strips trap sediments, nutrients, pesticides etc. So they filter runoff before it enters water bodies. Making soil acidic (b) is not a protective function. Adding salt (c) and increasing stream temperature (d) are harmful, not protective.

Rainwater (a) is a natural water source. Chlorophyll (b) is a plant pigment. Clean sand (d) is not a contaminant. Heavy metals like mercury, lead etc. are released from industrial processes (e.g., mining, manufacturing). They are toxic water contaminants.

When groundwater is over - used (pumped out more than it is recharged) for irrigation, the level of groundwater (water table) goes down. Rising water tables (a) would be if more water is added. Cleaner water (c) is not related to over - use. More rainfall (d) is a weather phenomenon, not caused by groundwater over - use for irrigation.

Answer:

a. Filtering runoff before it enters water bodies

Question 8