Crest of Juan de Fuca Ridge A *volcano Seafloor spreading West 50 100 300 400 mi

Question

Crest of Juan de Fuca Ridge A *volcano Seafloor spreading West 50 100 300 400 miles Silverthrone Caldera Franklin, 0 50100 500 kilometer Glacier A Mount Meager A Mount Cayley AMount Garibaldi AMt. Baker WASH A Polar reversal Peak time scale: ages are in millions of years ago AMt. Rainier Mount St Colors indicate rocks AA Helens Mt. Adama of normal magnetic polarity like now. o A Mt. Hood LA The north-seeking end of a compass needle would have pointed in O AMt. Jefferson the general direction of the geographic North A Three Sisters -6 Pole. A Newberry White areas have reversed magnetic A Crater Lake polarity At those -8 times, the north and south poles exchanged positions. The Mount A A Medicine north-seeking end of a Shasta Lake Volcano compass would have pointed in the general Lassen Peak A -11 direction of the geographic South Pole. Crest of Gorda 12 Ridge Seafloor spreading east Magma

Explanation / Answer

2.

The average rate and direction of seafloor spreading in cm per year in the east of the Juan de Fuca Ridge from B to A is,

                               Seafloor spreading rate = 500 km/ 12 million years = 4.17 cm/yr

3.

The average rate and direction of seafloor spreading in cm per year in the east of the Juan de Fuca Ridge from B to C is,

                               Seafloor spreading rate = 400 km/ 10 million years = 4.00 cm/yr

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