CK-12 Foundation
Ck 12: Earth Science: Volcanoes at Hotspots
[Free Registration/Login may be required to access all resource tools.] Volcanoes can form at hotspots away from plate boundaries. This article discusses hotspot activity and how it leads to volcanism in the oceans.
CK-12 Foundation
Ck 12: Earth Science: Availability of Natural Resources
[Free Registration/Login may be required to access all resource tools.] Explores some of the factors that affect the cost of resources, such as availability, ease of extraction, and politics.