Figure 1. The map below shows the global relief of Earth, including the land area and seafloor area. On land low-lying areas are shown in light green and high areas are shown in read and gray. Below the ocean surface, shallow areas are shown in light blue and deep areas are shown in progressively darker shades of blue.
1. Identify major features on the seafloor:
a. Continental shelves and slopes
b. Abyssal plains
c. Seamount island chains
d. Mid-ocean ridges (mid Atlantic, East Pacific Rise)
e. Subduction trenches (Alaskan, Peru-Chili, Japan, Marianas)
Figure 2. The map below shows the plate boundaries (yellow lines) superimposed on the global relief map.
2. How do the plate boundaries correspond to the features you observed in Figure 1.?
Figure 3. The map below shows earthquake locations (red dots) superimposed on the global relief map.
3. How do the locations of earthquakes relate to the features you observed in Figure 1. and the plate boundaries you observed in Figure 2.?
Figure 4. The map below shows the age of the seafloor (the basaltic crust beneath the sediment cover) in color coding. The red colors are 0-5 million years; the brown colors are 5-40 million years; yellow colors are 40-80 million years; green colors are 80-110 million years; light blue colors are 80-150 million years; dark blue colors are 150-180 million years.
4a. How old is the oldest ocean floor (in million of years) and where are the oldest parts of the ocean floor found?
4b. How young is the youngest ocean floor and where are the youngest parts found?