Our planet is home to all kinds of lizards. Lizards hatch from eggs, have a backbone, scales, four legs and a tail, which they sometimes lose and grow back.
Fish swim in big schools. Baby ducks waddle in a straight line. Ants and bees divide up labor. The world is full of animals that live in groups and they do it for a few different reasons.
We can make glass in factories and we can find it in nature. Some volcanoes make glass. When they spew out lava, it often cools into obsidian, a black glass.
It all has to do with our atmosphere. We may not always think about it, but we are basically living in a giant ocean of air. See the full answer, featuring WSU environmental engineer Shelley Pressley, at the Dr. Universe website.
While a stove or oven produces heat, a fridge can’t actually produce something called “cold.” So, how does a refrigerator manage to keep all your food cool? We have to engineer it. We must design a system that can carefully remove heat and put it somewhere else. See the complete answer on the Dr. Universe website, […]