As they multiply, die and decompose, algae deplete the ocean’s surface layers of oxygen. often, the large amounts of farm fertilizer that run from fields into the rivers cause algae populations to explode. the most likely result is that

The population of algae in the water increases due to the excess amount of nutrients such as nitrogen and phosphorous, which are provided from the run off from the farmlands. Due to this higher nutrients, the amount of dissolve oxygen decreases drastically, and aquatic plants cannot undergo the process of photosynthesis. This directly affects the organisms that lives in the fresh water and marine ecosystem, as it will be difficult for them to survive.

Thus, the excess amount of algae in water makes it unsuitable for drinking, agricultural purpose and also leads to the reduction of aquatic species.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves