World Geography
The last major glacial period began about 2,000,000 years before present and is commonly known as

Pleistocene or ice age
Holocene or ice age
Pliocene or ice age
Paleocene or ice age

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World Geography
The relative abundance of dissolved salts in seawater in descending order is as follows

sodium, chlorine, magnesium, potassium, sulphate, calcium
chlorine, sodium, sulphate, magnesium, calcium, potassium
chlorine, magnesium, calcium, sodium, potassium, sulphate
chlorine, sodium, magnesium, calcium, potassium, sulphate

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