This is like the tricky questions you got in high school. In a sense, there are two answers to this question, both of them right. Strictly speaking, there is only one ocean, a great body of saltwater, which altogether covers about 72% of the Earth’s surface and surrounds the planet’s great landmasses. … Read more
We can define an electric current as the flow rate of an electric charge past a certain point. This sort of current exists when we have a net flow of electric charges within a particular region. When we look at an electric circuit, we can see that the charge itself is carried … Read more
Red Blood Cells The liquid part of our blood is called plasma. In the plasma, there are millions of tiny cells. Each of them is too small to be seen except under a microscope. Of these cells, the red ones are by far the most numerous. In spite of their small size, … Read more
