ayers & Currents is a fun section. You will learn how density and temperature affect water layers. Have you ever noticed when you swim in a pool or lake that as you swim deeper the water changes temperature? Did you ever wonder why that happened? Click on “Layering Water” below to get started! Then, make your own ocean currents in “Oceans in Motion.” With a neat instrument that bends light, become a whiz at “Measuring Salinity.” Use computer maps of the Chesapeake Bay to investigate how “Weather & Salinity” are related.