Our planet is getting warmer. Every year, NASA and NOAA calculate the average surface temperature around the globe. These annual temperature data make up the global temperature record – and it’s how scientists know that the planet is warming. Red spirals in this visualization indicate years with warmer-than-average temperatures. The visualization “turns red” after 1975, showing that most of Earth’s warming has occurred in the last several decades. Overall, the average global temperature on Earth

351K views · 238 shares | Simple activity which provides a nice visualization of surface tension draw your child's attention to the water surface. It should be bulging out, sort of like a balloon. As the coins are added the surface of the water rises over the cup #thedadlab_experiments | TheDadLab | Facebook