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serious [3.7K]
1 year ago
14

The igneous and metamorphic rocks of the Peninsular Ranges in southern California and the Baja Peninsula are the result of ____.

Geography
1 answer:
ololo11 [35]1 year ago
7 0
Answer:

c) A hot spot.

Explanation:

Igneous rocks form when magma cools and crystallizes, at volcanoes on the surface (extrusive) or under them (intrusive).
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3 years ago
What percentage of Africans live in sub-Saharan Africa? *
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slava [35]

More than 75 percent

Explanation:

Let us carefully analyze this problem:

The half life of the rubidium isotope = 50 billion years

   The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.

  Every 50years, we know that a rubidium isotope would split into half.

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When the isotope decays to half; we would have equal number of parent and daughter:

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At this time, we should know that only 9.2 percent of the daughter would have been formed.

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The ratio of parent to daughter  = 90.8 : 9.2

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