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You can explore these topics in any order. There are links to suggested background and related topics on each page. 

Why are ice, liquid water, and water vapor so different?
Blue and white iceberg floats on the ocean.
Photo by Tina Rolf on Unsplash
What are matter and energy?
A wood fire burns on a beach with the sun near the horizon in the background.
Photo by Michał Mancewicz on Unsplash
How can it be useful to think in terms of systems?
Plants in soil inside a glass jar with a lid on top.
Photo by Maud Bocquillod on Unsplash
What are some of the many ways we use models?
A model of a human head and upper torso shows two layers, one of the skin and the other of bones, blood vessels, and organs beneath the skin.
Photo by Nhia Moua on Unsplash
What is a chemical reaction? How can we use equations to describe reactions?
The chemical equation for the burning of methane shows "CH4 + 2O2 → CO2 + 2H2O"
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