1. the rocky mountains extend from the mexican border up through canada and alaska. true or false 2. glaciers have sculpted mountains and carved out valleys but no longer flow and shape the landscape today. true or false 3. the us congress passage of the homestead act in 1862 can be considered a "pull" factor that caused people to migrate to the u. s true or false 4. logging is the main threat to old growth forests found in the northwestern united states. true or false

1. True - The Rocky Mountains spread through most of North America, as a line from north to south.
2. False - Glaciers do sculpt mountains, but they still exist today.
3. True - Giving free land to new settlers encouraged people to migrate to the western part of the country.
4. True - Logging is the biggest problems for the old growing trees cause they need lot of time to grow back, also a big problem cause the wildfires.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.