Septic tanks, city dumps, and watery waste from human activity may contaminate groundwater. Among many things which contribute to contamination are chemicals found in laundry detergents.
Lots of salt on icy roads in the winter may lead to sodium chloride (NaCl) contamination.
Another very common contaminant to ground water is some fertilizers used in farming which are healthy for plants, but toxic to humans.
How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more
You have seen water in lakes, rivers, and even your bathtub. But some water hides below the ground. It’s called groundwater! If you traveled underground deep enough, you would find that the rocks around...more
Chesapeake Bay is an estuary that has a lot of plants, fish and animals living in it. The plants are really important in Chesapeake Bay. The fish, birds and other animals eat the plants. And sometimes...more
The density of pure water is 1000 kg/m3. Ocean water is more dense because it has salt in it. Density of ocean water is about 1027 kg/m3 at the top of the ocean. Less dense water floats on top of more...more
Salinity is the measure of how much salt is in water. Ocean water has a high salinity and fresh water has a very low salinity. Sometimes, salinity is measured in parts per million (ppm). Ocean water has...more
Have you ever been swimming in the ocean? If you got any of the water in your mouth, you'll know that that water is SALTY! Ocean water is salt water. Water found in rivers, lakes, creeks, and streams...more
A lake is a body of water completely surrounded by land. Lakes can either by salty or fresh water. Most lakes are in places where glaciers used to exist. When a glacier moves forward, it carves away a...more
Earth's ocean covers more than 70% of our planet's surface. There are five major ocean basins: the Pacific, the Atlantic, the Indian Ocean, the Arctic Ocean, and the Southern Ocean that surrounds Antarctica....more