Why do countries import goods

All countries need or choose to import at least some goods and services for the following reasons: goods or services that satisfy domestic needs or wants can be produced more inexpensively or efficiently by other countries , and therefor sold at lower prices.

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.

Magma is outside the volcano  and lava is inside the volcano.