Islands • Essential Questions: • What is an island? • How are islands different from • continental masses? • What are some advantages and disadvantages of an island?
Objectives:Students will be able to: • Describe what an island is • Locate the world’s 20 largest islands • Describe some of the characteristics of four different kinds of islands • Describe some of the advantages and disadvantages of being an island.
What is an island? A body of land surrounded by water, (as opposed to a peninsula) Less than continental size Above water at all times Large enough to support life
Varieties of islands Continental islands Part of the continent shelf, and of the same geologic composition as the continent, but separated from the mainland by water, either through rifts, erosion, subsidence, or a rise in sea level.
Varieties of islands Continental islands Example: Madagascar
Varieties of islands Oceanic islands Rise from the ocean floor often through volcanic action.
Varieties of islands Oceanic islands Example: Hawaii
Varieties of islands Coral islands Formed in shallow water by the activities of coral, a living thing.
Varieties of islands Coral islands Example: Florida Keys
Varieties of islands Barrier islands Formed by deposition, either from rivers or ocean currents. Barrier Islands are often parallel to the coast, made of sand or silt, and are relatively unstable.
Varieties of islands Barrier islands Example: San Padre Islands (Texas)
Underline the names of the 20 largest islands Map Activity Cuba Victoria Ellesmere Baffin Greenland Newfoundland Iceland Great Britain Ireland Madagascar Sumatra Java Borneo Celebes New Guinea North Island, NZ South Island, NZ Mindanao Luzon Honshu
Brainstorming Activity How are islands unique? Climate More influenced by the ocean More moderate climate Not always wet
Brainstorming Activity How are islands unique? Surrounded by water Safety (Great Britain) Isolation (New Zealand) Cultural distinctiveness (Ireland) Biological diversity (Galapagos)
Brainstorming Activity How are islands unique? Transportation and Location Transportation stop (Hawaii) Location advantage (Manhattan) Transportation disadvantage (Isle Royale)
Brainstorming Activity How are islands unique? Economics Linked with unique physical or cultural characteristics (Jamaica) Linked with location (Guam) Tourism!
Group Activity Describe the location and characteristics of _______ Island. State why it is considered an island, and what kind of island it is. Describe two advantages and two disadvantages it has because it is an island.