What happens when cold air meets warm air?
You said a front is a wall of dark cloud. A front is the moving boundary between two air masses; clouds and storms gather along it.
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1 lesson for “Air masses and fronts”
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Is water's molar mass 17 or 18 g/mol?
The subscript 2 in H2O is easy to miss in a molar mass. Count it once, and every conversion after stays right.
Try this lessonIs carbon ever created or destroyed?
You said burning makes new carbon. The atoms were already here; burning just moves stored carbon back into the air.
Try this lessonWhere does a growing plant's mass come from?
You said the soil feeds the plant. Soil holds water and minerals, but most of the tree's wood is built from carbon in the air.
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