Across
1
Molten rock beneath Earth surface
4
Disturbance that transfers energy
6
Hottest planet in solar system
8
Push or pull on an object
9
Gas essential for breathing
11
Unit of heredity
13
Particle of light
14
Unit of power
Down
2
Biological catalyst
3
Smallest unit of an element
5
Force that attracts objects together
7
Unit of force
10
Solid with repeating atomic pattern
12
Unit of energy
15
Blocking of light by a celestial body