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Earth & Space Ch.1

Across
For soil to drain well it must contain this
Substances composed of two or more elements bonded together
A sensible explanation to a scientific problem
Humus is formed as a result of this
The pull of gravity on an object
Soil mixture of sand, silt, clay, and humus
A theory that has never been proven false
Measures how tightly packed matter is
Down
Measures amount of matter in an object
Plant with short stems, few leaves,and pale green need more of this
Farmer should apply this to crop when fruit starts to ripen;"firm up"
Substances composed of only one type of atom
Primary plant food element found in the ashes of burned fruit; think pot-ASH
Fertilizer labeled 10-8-14 would contain 10% of what element; alphabetical order
Formed by lightning, nitrifying bacteria, and nitrogen-fixing bacteria
Substance having a pH of 10
Legumes allow nitrogen-fixing bacteria to form swellings called _ on there roots.