Question

question 1 (5 points)
listen
whats responsible for eutrophication in seawater?
a) runoff of artificial fertilizers
b) seafloor spreading
c) groundwater infiltration
d) deposition of sediments on shorelines
question 2 (5 points)
listen
why are most of earths deserts located in the subtropical zone?
a) these regions are very warm but more humid than other regions.
b) these regions are very warm but less humid than other regions.

Explanation:

Question 1

Eutrophication is caused by an over - enrichment of nutrients, especially nitrogen and phosphorus. Artificial fertilizers are rich in these nutrients. When there is runoff (e.g., from agricultural fields after rain), these fertilizers enter seawater. This excess of nutrients leads to algal blooms and subsequent eutrophication. Seafloor spreading is a geological process related to plate tectonics and has no direct relation to nutrient levels in seawater. Groundwater infiltration usually brings in relatively clean water (compared to runoff with fertilizers) and is not a major cause of eutrophication. Deposition of sediments on shorelines is more about physical changes in the coastal area rather than nutrient - induced eutrophication.

Deserts are areas with low precipitation. In the subtropical zone, there is a high - pressure system. High - pressure systems are associated with descending air. As air descends, it warms (adiabatic warming). Warm air has a higher capacity to hold moisture (relative humidity decreases as air warms when the actual moisture content is constant). So, these regions are warm (due to the general latitude - related temperature) but have descending air that suppresses cloud formation and precipitation, making them less humid. If a region were more humid (as in option A), it would not be a desert.

Answer:

A. Runoff of artificial fertilizers

Question 2