It is called surface currents.
Britain is a VERY VERY BAD PLACE for <u><em>agriculture </em></u>
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It needed colonies with very good agricultural farming land so that it could grow crops/materials and <u>sell them to make profit</u>
Also England wanted power and status so it decided to show off by taking large amounts of land also that could be used for warfare
Because of the need for water and other resources. Central Australia is mainly desert, and has a hot, dry climate.