Name Course/Section: Date Analyze the seafloor part of the map below just off th

Question

Name Course/Section: Date Analyze the seafloor part of the map below just off the Pacific Coast, west of California, Oregon, Washington, and southwest Canada. The colored bands are seafloor magnetic anomalies. Colored bands are rocks with a positive magnetic anomaly, so they have normal polarity, like now. The white bands are rocks with a negative magnetic anomaly, so they have reversed polarity. Different colors indicate the ages of the rocks, in millions of years as shown in the polar reversal time scale provided. 1. Using a pencil, draw a line on the sea floor to show where new ocean crust and lithosphere is forming now (zero millions of years old). Using FIGURE 2.2 as a guide, label the segments of your line that are Juan de Fuca Ridge and Gorda Ridge (divergent plate boundaries .Then label the segments of your pencil line that are transform fault plate boundaries. Add half arrows to the transform fault boundaries to show the relative motion of the rocks 50 100 300 400 miles Silverthrone Caldera A 500 kilometers Franklin 0 50 100 Glacier A Mount eager A Mount Cayley Mount Garibaldi A Mt. Baker WASHING A Peak Polar reversal time scale: ages are in millions of years ago AMt. Rainier Mount St Colors indicate rocks Helens Mt. Adama of normal magnetic polarity like now. o A Mt. Hood The north-seeking end of a compass needle Crest of would have pointed in Juan de Fuca O Mt. Jefferson the general direction of Ridge the geographic North AThree Sisters Pole. A Newberry White areas have reversed magnetic A Crater Lake polarity At those 8 times, the north and OREGON south poles exchanged positions. The Mount A A Medicine north-seeking end of a Shasta Lake Volcano compass would have A volcano pointed in the general Lassen Peak A 11 direction of the geographic South Pole. Crest of Gorda 12 Ridge Seafloor Seafloor spreading spreading West east Magma

Explanation / Answer

The figure represents that the natural events that occured in the Ocean. The oceanic plates move away one another to some distance. The new oceanic lithosphere is formed at the point B, because here the two oceanic plates starts to move. So this point also represents zero million years.

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