The core is the_layer of earth

the correct answer is d. the lengths of side sr and side s’r’ are in the ratio 1: 3.

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explanation:

scientists think that convection currents flow in earth’s mantle. correct answer: b

convection currents are created because of heat rising and falling inside the mantle. they are generated by radioactive decay in the core. the convection currents move the plates and this activity inside the earth is called plate tectonics.