6 GIS enables users to combine layers to customize information. If a hiker were planning to go into the wilderness to study rock types, which layers would be
most helpful to the hiker?

In 1933 the 21st amendment was added to the u.s. constitution, allowing for the manfacture, transportation, and sale of alacoholic beverages in the united states. why was this amendment needed?

Explain: plate tectonics and people.

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors