Earth Science Water systems on Earth Outcome D

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Earth Science: Water systems on Earth Outcome D 1 – Explain the significance of

Earth Science: Water systems on Earth Outcome D 1 – Explain the significance of salinity and temperature in the world’s oceans

Distribution of water on Earth – When we look at satellite images, about 70%

Distribution of water on Earth – When we look at satellite images, about 70% of Earth is covered in water

Distribution of water on Earth – About 3% of all of this water is

Distribution of water on Earth – About 3% of all of this water is “freshwater” – Freshwater is water that we can drink – The other 97% is saltwater, mainly in oceans – Removing salt from saltwater to make it drinkable is still very expensive

Distribution of water on Earth All water on earth Saltwater (97%) Freshwater (3%) Lakes

Distribution of water on Earth All water on earth Saltwater (97%) Freshwater (3%) Lakes and rivers Ground water Icebergs and Glaciers

Freshwater vs Salt water – Salt water has a lot of salt in it

Freshwater vs Salt water – Salt water has a lot of salt in it About 35 g of salt in every Litre of water. – Salinity – the amount of salt dissolved in water (How “salty” the water is) – Ocean water vs fresh water: 1. Ocean water has a density 1. 027 g/m. L instead of 1. 0 g/m. L 2. Ocean water freezes at about -1. 9 o. C instead of 0 o. C

Oceans on Earth – Ocean currents – a large amount of ocean water that

Oceans on Earth – Ocean currents – a large amount of ocean water that moves in a particular direction, without changing

Oceans on Earth – Ocean currents help to circulate (move): minerals, oxygen, carbon dioxide,

Oceans on Earth – Ocean currents help to circulate (move): minerals, oxygen, carbon dioxide, and nutrients that are dissolved in the ocean water – Ocean currents are divided into two types: 1. Deep water currents 2. Surface currents

Oceans on Earth – Deep water currents – are caused by salinity and ocean

Oceans on Earth – Deep water currents – are caused by salinity and ocean temperatures – Cooler water is more dense and sinks beneath the warmer water. As the water sinks, it causes the movement of water – Water with high salinity is also more dense. This works like cooler water, where it sinks and causes the movement of water

Oceans on Earth – Surface currents – are caused by wind, the Earth’s spin,

Oceans on Earth – Surface currents – are caused by wind, the Earth’s spin, and the shape of the continents – Wind – caused by the temperature differences on the surface of the Earth

Oceans on Earth – Earth’s spin - The Earth spins from West to East.

Oceans on Earth – Earth’s spin - The Earth spins from West to East. As winds and currents move, its pathway changes due to the Earth spinning.

ONE MINUTE TO THINK OFIS AN WITH YOUR TIME UPANSWER 30 SECONDS LEFT PARTNER

ONE MINUTE TO THINK OFIS AN WITH YOUR TIME UPANSWER 30 SECONDS LEFT PARTNER