All Science Fair Projects

Oil spill effects

Oil is an organic substance with a lower density than water. When oil is poured or spilled on water, the two substances do not mix together. The oil will form an even and thin layer floating over the surface of the water. This thin layer of oil over the surface of the water is called "sheen". In natural water bodies like lakes or the ocean, oil spills can spread over a large surface area and unless they are removed quickly, they can cause the death of aquatic plants and animals.

Sheen on the water surface prevents light and air from reaching plants and animals in the water. This prevents aquatic plants from performing photosynthesis to produce food and oxygen. Without photosynthesis, plants will not be able to grow or germinate and they will eventually die if the condition persists. Oil spills also encourage the growth of algae, which also adversely affect the growth of aquatic plants.

Elodea

Elodea is an aquatic plant that is also known as waterweed. It is also often grown as an aquarium plant for decorative purposes, as it is attractive to look at. Elodea plants are a very important part of the ecosystem because they provide good habitats for small fish, amphibians and aquatic invertebrates. They are also a food source for some aquatic  animals, such as turtles, ducks and beavers.