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Tutor profile: David S.

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David S.
M.S. Geology and Middle School STEM Teacher
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Questions

Subject: Geology

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Question:

I have seen pictures of faults where the strata are offset. Are earthquakes generated everytime a fault forms?

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David S.
Answer:

Faults come in all sizes. Large faults such as the famous San Andreas Fault in California, often do cause earthquakes when the rocks move along the fault. Some fault movement may be sudden but so small that our seismographs do not record a shaking of the ground. Other faults such as the growth faults in the Gulf of Mexico are formed in relatively soft rock or even through unconsolidated sediment. Movement along these faults does not result in earthquakes.

Subject: Basic Math

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Question:

If I spend 10 % of my money, why won't earning 10% on the remainder get me back to where I started?

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David S.
Answer:

Looking at an example, lets say you lose 10% of $100. You now have $90 dollars. If you earn or gain 10% on the $90, you have $90 +$9 = $99. This example shows a reduction of 10% then a gain of 10%, As shown above, earning 10% on a reduced number will not return the total to the original amount. After losing 10% of a number, it requires a gain of more than 10% to return to the original value.

Subject: Earth Science

TutorMe
Question:

Magma and lava are both hot molten or melted rock, so what is the difference between magma and lava?

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David S.
Answer:

Magma and lava are both hot molten material that when cooled, will become rock. The difference is that magma is the name applied to the molten material while it is inside the earth. Once ejected or flowed from a fissure or volcano, the molten material is considered lava.

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