Across
1
Amplified beam of light
4
Biological catalyst
5
Nerve cell in the brain
Down
2
Force that attracts objects together
3
Form of thermal energy
4
Our home planet
6
Blocking of light by a celestial body
7
Unit of heredity
Amplified beam of light
Biological catalyst
Nerve cell in the brain
Force that attracts objects together
Form of thermal energy
Our home planet
Blocking of light by a celestial body
Unit of heredity