A bird feeder was placed in the school yard. Students from each science class recorded the number of birds who visited the feeder. The next day the teacher shared the results with the class. What conclusion can be made from the data?

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.

not: both offer magnification to the atomic level.