|What is an unhealthy substance in our environment?
|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?
|What is most of the water on Earth?
|What is weathering?
||breakdown of rocks to make sediment
|What type of rock usually has fossils?