Across
1
Tissue that contracts for movement
4
Magnetic metallic element
6
Element found in all living things
8
Our home planet
9
Push or pull on an object
10
Preserved remains of ancient life
11
Second lightest element
Down
2
Absolute temperature scale unit
3
Curved glass that refracts light
5
Center of an atom or cell
7
Path of a planet around the sun
12
Measure of matter in an object