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Crucigrama Sopa de Letras Hoja de Trabajo
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5.2.a Changes in the spheres

Horizontales
Charged atoms
Another name for rusting
Sediments deposited without rust
A sphere of the ocean containing the oceans
Iron oxide
An ion in our primitive oceans
Sedimentary layers that earn Australia a lot of export dollars
A type of photosynthetic bacteria
The most primitive of all bacteria
"Fancy"/Chemical name for rust
An environment without oxygen
A smelly gas thought to have been in the Earth's primitive atmosphere
Verticales
The thin sphere of gases that envelop the Earth
Made up of three atoms of oxygen
The sphere that contains life
Shortened form of iron rich sedimentary structures
Our planet
The "thing" you change about an experiment
A reactive metal
A very important chemical reaction that changed the Earth's spheres
The change brought about in the experiment by the independent variable
A chemical desiccating agent
A common gas thought to be more common in Earth's early atmosphere
The rigid layer of the Earth
A gas thought to have been in the Earth's primitive atmosphere
A byproduct of photosynthesis