"right now it is very difficult to make predictions as to when a landslide will occur precisely, because we don't know about ...

Materials all have different properties. Properties help us to describe the materials. Some are soft, some are hard, and some are even waterproof. Learn about some different materials and their ...

Explain that because different materials have different properties, they are used to make different things. Rocks are hard so they are used to make cement for sidewalks or stone for buildings. Cotton ...

Sometimes it is very hard (or impossible) to make an experiment a totally fair test. You could use a bowl, some large elastic bands to secure the different materials you are testing over the top ...