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Measuring longitudes on Earth

1. How many different plates (not boundaries) are clearly shown on the map?

2. Indicate on the map the most likely location of a midocean ridge (such as the Mid-Atlantic Ridge). Write the label “Midocean Ridge” on the map.

a. What type of plate boundary is this?

b. What evidence shown on the map indicates that this type of boundary is present?

3. Indicate the most likely location on the map of a major volcanic mountain range similar to the Andes in South America with the label “Volcanic Mountain Range”.

a. What type of plate boundary is this?

b. What evidence shown on the map indicates that this type of boundary is present?

4. Label all plate boundaries where oceanic trenches should be found with the label “Trench”.

5. Assume only one of the volcanoes on the map is a hot spot. Label this volcano “Hot Spot”.

a. Draw an arrow extending from this volcano, indicating the direction of plate movement (and the direction in which you would expect to find progressively older, extinct volcanoes).

6. In the space below, draw an approximate continuous cross section (“side view”) of the ocean basin from Point A to Point B (from lower left to upper right). Use the “side view” drawings for reference, and use arrows to indicate the relative direction of plate motion. If subduction is taking place, clearly show which plate is subducting beneath the other.

Use pages 22-23 (or pages 6-7 in the 23rd edition) in Goode’s World Atlas to answer the following questions.

7. The Sumatra-Andaman earthquake on 12/26/2004 was centered near 3° N latitude, 96° E longitude.

a. What type of plate boundary is present (for example, is this a convergent or a divergent boundary)?

b. Name the plates involved Check the Atlas or the figure “Major Lithospheric Plates” on the first page of this packet to find the plate names (for example, the North American plate and the Juan de Fuca plate).

c. Since this earthquake occurred under water, what additional natural disaster accompanied this earthquake?