1. Strain was defined as the amount of distortion (extension or compression) that takes place per unit of length.
2. Stabilityis the ability to resist changes in shape and size over time.
3. Force caused material to become stressed.
4. Geothermal energy was produced below the earth's surface.
5. The main sources of greenhouse gas emissions include fossil fuel generating by plants and transportation vehicles.
6. Manufacturers chose plastic containers for many different reasons.
7. Oil was formed in underground rocks millions of years ago.
15. Transform the sentences from Active into Passive, as in the example.
Example: Romans cremated Julius Caesar’s body 2,000 years ago.
Julius Caesar’s body was cremated 2,000 years ago.
1. Primitive man found metals free in nature.
2. They changed the shape of material by rolling.
3. Someone warped this wooden thing.
4. If someone mixed tin with copper the resulting substance would be harder.
5. The Egyptians and Assyrians made some use of iron a number of centuries before our era.
6. Scientists developed methods for separating iron from its ores in reasonably large quantities and at fairly low cost.
7. They deformed cold plastic by bending.