Question

which process causes wells on land to become saline, making them unusable for drinking water?
a) erosion
b) eutrophication
c) echo sounding
d) groundwater infiltration
question 6 (5 points)
which of the following is true of all geographic locations on earth?
a) they receive the same amount of precipitation over the course of a year.
b) they receive the same number of daylight hours over the course of a year.

Explanation:

• For the first question:
• Erosion is the process of wearing away rocks and soil. It does not directly cause well - water salinity.
• Eutrophication is the enrichment of water bodies with nutrients, usually leading to excessive plant growth. It is not related to well - water salinity.
• Echo sounding is a technique used to measure the depth of water. It has no connection to well - water quality.
• Groundwater infiltration can bring in saltwater (in coastal areas, for example) into wells, making the water saline.
• For the second question:
• Different geographic locations have different precipitation patterns. Some areas are deserts (low precipitation), and some are rainforests (high precipitation).
• Due to the Earth's axial tilt and its orbit around the Sun, while the total number of hours in a year is fixed (\(365\times24 = 8760\) hours), the distribution of daylight hours varies by location. However, when you consider the sum of daylight hours over the course of a year (accounting for seasons), all locations receive the same number of daylight hours over a year.

Answer:

• First question: D) Groundwater infiltration
• Second question: B) They receive the same number of daylight hours over the course of a year.