Across
- A form of calcium carbonate softer than marble but harder than chalk.
- Where a river joins the sea.
- Mass divided by volume.
- A light grey volcanic rock that floats on water.
- A flat deposit of rock.
- Thousands of years.
- Particle of rock like speck of sand.
- Deposition (laying down) of small particles of rock, usually on a sea bed.
- Shiny black, glassy volcanic rock. It has no crystals in it.
- Things happening one after the other.
Down
- Change state from liquid to solid.
- Physical, biological or chemical breakdown of rocks.
- Water in the solid state.
- The concentration of an acid in a substance, often measured with universal indicator paper.
- Black, volcanic rock with tiny crystals.
- Ability to soak up liquid like a sponge.
- A hard, white form of calcium carbonate that can be polished and that is used to make statues.
- Liquid drops that fall from the sky in a storm.
- Rubbing away, for example when rocks are swept along by a river.
- The transport of weathered rock.
- Hard, igneous rock with large pink, grey, black and white crystals.
- When water changes state from solid ice to liquid water.
- A chemical with a pH less than 7 that turns blue litmus paper red.
8h - The rock cycle Dr J E F Frost
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