Includes index.

Q 1: what are the Earth's layers? -- Q 2: what is magma? -- Q 3: how thick are Earth's layers? -- Q 4: what are the plates that make up Earth's crust? -- Q 5: what is continental drift? -- Q 6: how do the plates move? -- Q 7: how quickly do the plates move? -- Q 8: what is divergence? -- Q 9: what is a rift? -- Q 10: what is convergence? -- Q 11: how do plates form mountains? -- Q 12: what is subduction? -- Q 13: how do plated form ocean trenches? -- Q 14: how do plates form volcanoes? -- Q 15: what are transform boundaries? -- Q 16: what are faults? -- Q 17: what are slips? -- Q 18: how and why do plates cause earthquakes? -- Q 19: how did scientists come up with the idea of plate tectonics? -- Q 20: what do rocks and fossils tell us about plate tectonics?.