Suppose you conduct an investigation to find out the types of soil in your neighborhood. why would it be to test the soil at 10 different locations instead of just a single location?
a. to ensure that your observations are complete and representative of the entire area.
b. to provide extra data in case you lose some of it
c. to satisfy the requirement that experiments have a minimum of 10 data points.

A. To ensure that your observations are complete and representative of the entire area

Explanation:

This is the most obvious choice, considering that every experiment you conduct requires using your five senses.

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

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