A. Plate tectonics is a theory.
Tectonic plates are real because they are already predicted by scientists
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Earth's interior is generally divided into three major layers: the crust, the mantle, and the core. ... The outer core is molten and liquid iron and nickel, while the inner core is solid and much more dense than either iron or nickel at the surface.
Earth's atmosphere is a mixture of gases that surrounds our home planet. Besides providing us with something to breathe, the atmosphere helps make life on Earth possible in several ways. It shields us from most of the harmful ultraviolet (UV) radiation coming from the Sun, warms the surface of our planet by about 33° C (59° F) via the greenhouse effect, and largely prevents extreme differences between daytime and nighttime temperatures.
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