  LO: To be able to classify rocks by their appearance and properties Who would win in a fight, the metal or the rock? Why do you think this? Construction Conundrum

 Have a look at the rocks? How might we describe / compare them? Come up with 5 ways… Granite Marble Basalt Slate Sandstone Limestone

 The Museum The British museum in London wants a statue but wants it to last a long time. It should be resistant to weather. But what rock should they use? What properties should the rock have? Think of two you want to test. How could you test them? Come up with a plan. You have :

 You have:  Labelled rock samples  Dil. Hydrochloric Acid  Beakers  Watch glasses  Hand lenses  Universal Indicator  Electronic balances You are going to test two different properties of rocks. (So its two different investigations!)

 5 min planning to start off Possibilities to explore include: Porosity (little holes – how much water does it take on? Acid rain – How does it deal with acid? Does it wear away? Hardness – Will it scratch? Structure – Crystals?

Recording your Results Design a table to collect your results in This is usually the thing you change These are usually the things you have measured NEVER FORGET YOUR UNITS!!! (e.g. s, m, cm, N) Use a PENCIL and RULER

 RockLayers?Crystals?Grainy?Heavy?Bubble in water? Fossils?Other Sandstone Slate Limestone Basalt Schist Granite Results

  A rock is made of grains that fit together  Each grain in the rock is made from a mineral, which is a chemical compound Rock Appearance The grains in a rock can be different colours, shapes and sizes – this is what gives them different textures

  In some rocks the grains fit together and there are no gaps  Their grains are interlocking and these rocks are sometimes called crystals Rock Texture Interlocking grains, such as granite

  In other rocks the grains are rounded, and do not fit together (there are lots of gaps)  Their grains are non-interlocking Rock Texture Non-interlocking grains, such as sandstone

  Rocks with rounded grains are more likely to absorb water than rocks with interlocking grains because the water can get into the gaps between the grains  Rocks that absorb water are called porous  Rocks with rounded grains are usually softer and more crumbly than rocks with interlocking grains Porous

 Conclusions… Write a letter/create presentation to the director of the museum offering advice as to which rock they should choose/select to build statue. You must include evidence from your investigation to back up your recommendation.