We have been conducting experiments on rocks to find out more about them.
Ms Paterson led our investigation - we did a number of tests including...
...testing the hardness of a range of rocks to see which were the hardest and softest. We then tried to determine whether the rocks were sedimentary, igneous or metamorphic.
Sedimentary rocks are formed over millions of years when sediment is pressed together at the bottom of seas and rivers. Examples include sandstone, limestone and chalk. Some sedimentary rocks contain fossils.
Igneous rocks are formed when magma or lava from volcanoes cools. Examples include basalt and granite. Most igneous rock is very hard.
Metamorphic rock is formed when rocks are changed due to heat or pressure. Examples include slate and marble. Metamorphic rocks are also very hard but can be damaged by acid, for example acid rain on buildings.
We also did the acid test...
...using vinegar, to see which rocks reacted with the acid. As mentioned above, metamorphic rocks are the type likely to be affected.
We also used water to see whether any of the rocks were soluable.
Next week we will look at our results and see what conclusions we can draw from our experiments.
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