list three pieces of evidence that support the theory of plate tectonics.

Brief Explanations:

• Fossil Distribution: Similar fossils of ancient plants and animals are found on continents that are now widely separated. For example, the fossil of the freshwater reptile Mesosaurus is found in South America and Africa. This suggests that these continents were once connected as the reptile could not have swum across the ocean.
• Mountain Ranges and Geologic Formations: Mountain ranges like the Appalachians in North America and the Caledonides in Europe have similar rock types, structures, and ages. This indicates that they were part of the same mountain - building event when the continents were joined.
• Seafloor Spreading: Mid - ocean ridges are areas where new oceanic crust is formed. The youngest rocks are at the ridges, and the rocks get older as you move away from them. Magnetic striping on the ocean floor (alternating bands of normally and reversely magnetized rock) also supports the idea that the seafloor is spreading as new crust is formed and moves away from the ridge.

Answer:

• Fossil distribution (e.g., Mesosaurus fossils on South America and Africa).
• Similar mountain ranges and geologic formations (e.g., Appalachians and Caledonides).
• Seafloor spreading (mid - ocean ridge characteristics and magnetic striping).