DSWO WEEK 17 2018
DSWO WEEK 17
1-3-18 Earth – earth’s crust – inferring
Granite consists of quartz, feldspar, mica and iron that fused as molten rock and eventually hardened. Many buildings have granite foundations and walls. Why is granite a good building material?
1-4-18 Physical – Matter – interpreting data
Water molecules are electrically charged, and wax (oil) molecules are not. An electrical charge can cause attraction between molecules. Why does rain bead up on a freshly waxed car?
1-3-18 The variety of materials in granite makes it strong yet relatively light. This is because the crystals of granite have air in them, making them porous, yet the iron content provides sturdiness. These characteristics allow granite to be transported and shaped fairly easily yet it does not easily collapse.
1-4-18 There is attraction between water molecules and very little attraction between water molecules and the molecules of a coating of auto wax. Therefore, the water molecules cling to each other and push away from the wax to make beads of water that roll off the surface of the car.