All Question On One Page true false The ocean is 3 kilometres deep. 2 World Oceans Day was first suggested more than 25 years ago. 1 More animals and plants live under the sea than live on land. 1 Plastic pollution is a new theme for World Oceans Day this year. 2 The temperature of the ocean is getting warmer. 1 People generally wear green on World Oceans Day. 2