Explores oceans and discusses how they affect the climate.

Includes index.

What do you know about the Earth's oceans? -- How much of the Earth is ocean? -- How many oceans and seas are there? -- Who do oceanographers do? -- Why is the ocean blue? -- Why is the ocean salty? -- How are Earth's ocean's part of the water cycle? -- What are the layers of the ocean? -- Where is the ocean the deepest? -- Where is the ocean the warmest? -- Where is ocean water the coldest? -- How do oceans affect climate? -- What are currents? -- How do ocean currents affect climate? -- What causes tides? -- What causes waves? -- How do oceans become polluted? -- What is the Great Pacific Garbage Patch? -- What is polar ice? -- How does climate change affect polar ice and Earth's oceans? -- How can we protect Earth's oceans?.