GEOG Lab VII Exercise 33

After drawing in the plate boundaries using the appropriate symbols on the tectonic map provided, answer the following questions. 1. a) How many different plates (not boundaries) are clearly shown on the map? b) How many of the plates on the map consist entirely of ocean floor (or ocean floor with islands)? 2. b) What type of plate boundary is this (location of a mid-ocean ridge indicated on the map as "#2")? c) What evidence shown on the map indicates that this type of boundary is present?

1. a) 4 b) 2 2. b) Divergent c) Age of ocean floor increases away from band of shallow earthquakes.

Based on the average of your five answers in problem 1, what has been the approximate rate of movement of the Pacific Plate in the area of the Hawaiian Islands over the last 5.1 million years?

110 mm per year

Midway Island, to the northwest of Hawai'i, is also part of the Hawaiian chain and is believed to have been produced by the same hot spot. Midway is about 2430 kilometers (1510 miles) from the Kilauea volcano on Hawai'i. Use the Average rate of plate movement you calculated in problem 2 to estimate the age of volcanic rocks you would expect to find on Midway island.

22 million years

After drawing in the plate boundaries using the appropriate symbols on the tectonic map provided, answer the following questions. 3. b) What type of plate boundary is this (major volcanic mountain range indicated on the map as "#3")? c) What evidence shown on the map indicates that this type of boundary is present? 4. b) What type of plate boundary is this (volcanic island arc indicated on the map as "#4")? c) What evidence shown on the map indicates that this type of boundary is present?

3. b) Ocean-continent convergent c) Shallow to deep-focus earthquakes; volcanoes. 4. b) Ocean-ocean convergent c) Shallow to deep-focus earthquakes; volcanic islands.