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vocabulary review

Teacher: Bowley
Across
Actual age of a rock
The use of technology to alter or improve living things
Carry a positive charge
A combination of two or more substances that are not joined together chemically
Series of steps that a scientist follows
Someone who designs, constructs, and operates new forms of technology
Down
Basic building blocks of most of matter
Electrons in the outermost energy level of an atom
The variety of organisms in a place
Group 18 of periodic table
Mass divided by volume
Contains organisms that can breed to produce fertile offspring