8C2

• A mixture of sand and water can be separated by filtration. This is because the sand particles are too big and are trapped by the filter paper.
• A mixture of salt and water cannot be separated by filtration. This is because the salt particles are small and pass through the filter paper.
• Filtering can separate a solid which does not dissolve from a liquid.
• Filtering cannot dissolve a dissolved solid from a liquid.
• When a liquid evaporates, the particles have different energies. Some will have enough energy to escape from the liquid and become a gas.
• Evaporation is good for separating a soluble solid from a liquid.
• Distillation is a separation process that is used to separate a solution.
• There are 3 layers that make up the Earth's structure. The 3 layers starting from the outside are:

  The crust - the rocky outer layer.

  The mantle - the semi-solid middle layer.

  The core - the innermost layer which is divided into an inner core and outer core.
• Rocks are solid at room temperature. Rocks are made from grains. Each grain is made from a mineral.
• Sedimentary - formed from sediments.

  Igneous - formed from molten rock.

  Metamorphic - formed from rocks that have been changed because of heat or pressure.
• The rock cycle:

  A) Magma

  B) Metamorphic

  C) Igneous

  D) Sedimentary