In an ecosystem, plants and animals all rely on each other to live. Scientists sometimes describe this dependence using a food chain or a food web. Read on to find out more information and play …
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Food chains and webs
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Thought experiments
The great scientist, Albert Einstein, used thought experiments to help him develop his amazing relativity theories about space and time. He used these imaginary experiments because it wasn’t actually possible at that time to do …
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Chemical and Physical Changes
There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn’t change what the substance is. In a chemical change where there is a chemical …
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