A type of spring found in Northern Europe that produces sporadic, forceful torrents of heated water and steam

A foreign plant or animal that travels on the hull or in the hold of a ship and endangers local organisms

An alternative energy source that taps the heat generated by tectonic activity

A type of erosion that scraped, scoured, and sculpted the landforms of Northern Europe

A way of enjoying travel without harming the environment

A steep, seawater-filled valley carved out by glaciers

An approach to providing for the well-being of all residents

supported by a government

The type of government in which royalty and elected officials share powers

A transport practice that results in large shipments divided into smaller amounts for distribution to other places