Lab Activity_ Tectonic Plate Movement
Figure 1
Black smokers, shown in Figure 2 of the oceanic ridge, form when hot water
(approximately 350
o
C) containing dissolved metals flows onto the ocean floor
through the cooling and crystallizing lava and volcanic rock at the oceanic ridge.
Sulfide minerals precipitate from the hot water forming chimney-like masses
(photograph on right). A black smoker is a deep-sea hydrothermal vent.
1.
Read the description of the picture (figure 2) above, and answer: Is line 1 or 2
approximately parallel to the magnetic strips that form along oceanic-ridges
when new oceanic crust forms at spreading centers?
Line 1 is approximately parallel to the magnetic strips that form
along oceanic-ridges when new oceanic crust forms at spreading
centers
2.
An oceanic ridge is a
divergent plate
boundary. (1pt)
3.
Oceanic lithosphere is subducted under continental lithosphere to form a(n)
Ocean trench,
as showing in figure 3 below
.
1
Figure 1
2
1
Figure 2
