| Question | Answer |
|---|---|
| What is an unhealthy substance in our environment? | pollutant |
| What is urban growth? | building new neighborhoods and shopping areas |
| What is an effect of urban growth? | increase in erosion, less open land, more pollution |
| Why is burning coal bad for our environment? | can cause sulfur dioxide and lead to acid rain |
| What is soil made of? | rock and organic material |
| How much fresh water do we have on Earth? | 3% |
| What is most of the water on Earth? | salt water |
| What is weathering? | breakdown of rocks to make sediment |
| What type of rock usually has fossils? | sedimentary |
