Human activity has a great impact on waterways. Decreased amounts of vegetation leads to erosion of water banks. Increased fertilizer and nutrients levels in water from agriculture, sewage, and industry lead to the formation of algal blooms and subsequent decrease in other aquatic organisms.
Angle 5 is congruent to angle 2.
When 2 lines cross each other, the 2 angles across from each other will be congruent.
This website could help you http://www.weather.gov/cle/Seasons
