Ineed right now awnser it from national geographic's online encyclopedia: the earth has three major layers. all known life exists on the solid outer layer, called the crust. beneath the crust is the mantle, a gooey, hot layer of magma and other semi-solid rocks and minerals. movement in the mantle leads to tectonic activity, such as volcanic eruptions and earthquakes, on the crust. the core, beneath the mantle, is the deepest and hottest layer of the earth. it is made almost entirely of metal. the core is made of two layers: the outer core, which borders the mantle, and the inner core. the inner core is shaped like a ball. scientists say the outer core is made mostly of iron and nickel. iron and nickel are two important metals found everywhere on the planet. (on the surface of the earth, these metals are found in solid form.) iron and nickel in the outer core form an alloy, or a mixture of metallic elements. the outer core is approximately 2,300 kilometers (1,430 miles) thick. the alloy of the outer core is very hot, between 4,000 and 5,000 degrees celsius (7,200 and 9,000 degrees fahrenheit). what theme, or topic, do both passages have in common? a) both question the full reliability of science. b) both question the role that imagination plays in discovery. c) both share a similar setting, and include a description of that setting. d) both suggest a kind of complementary relationship between science and imagination.