Which items are described by the geographic theme of human-environmental interaction?
1The Ural Mountains form the boundary between Asia and Europe.
2The Panama Canal has shortened trading routes.
3Canada has ten provinces and three territories.
4Panama's borders are Costa Rica, Colombia, the Caribbean Sea, and the Pacific Ocean.
5Central heating is a common feature in Canadian housing.
6Panama is a bit smaller than South Carolina.

Question

Which items are described by the geographic theme of human-environmental interaction?
1The Ural Mountains form the boundary between Asia and Europe.
2The Panama Canal has shortened trading routes.
3Canada has ten provinces and three territories.
4Panama's borders are Costa Rica, Colombia, the Caribbean Sea, and the Pacific Ocean.
5Central heating is a common feature in Canadian housing.
6Panama is a bit smaller than South Carolina.