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5.1.b

Across
Biggest group of time
Gas made by photosynthesis
Primitive photosynthesising bacteria
An important chemical reaction that traps light energy
Formed by the rusting of iron in a young Earth's ocean
Fourth planet in our solar system
Relating to life
Forms of an element
The lighter form of Carbon
Down
Dissolved metal in early oceans
A large aquatic carnivore
Rocks containing evidence of life
Remains of past life
Earliest form of life
A chemical process in which a solid substance is produced from a liquid
Structures built by cyanobacteria
Large island in the northern hemisphere
The metamorphic equivalent of limestone