The word "ocean" is taken from the Greek
word Okeanos - a great river and the source of all water水shuǐ.
Oceans 海洋 hǎi yáng
cover about 70% of our planet Earth地 球 dì qiú. They play a
crucial role in producing oxygen 氧 yǎng
and they regulate the temperature温度wēn dù
and weather 天气 tiān qì.
Oceans 海洋 hǎi yáng
are habitats to many living things 生物 shēng wù.
Interestingly, many of the living things 生物 shēng wù
in oceans 海 洋 hǎi yáng
are yet to be discovered 发 现 fā xiàn.
Today, many scientists科 学家 kē xué jiā
are studying about the oceans 海洋
hǎi yáng
to help protect them.
Oceanographers 海洋学家 hǎi
yáng xué jiā study the oceans
海洋 hǎi
yáng.