The sun, is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
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Related: downward, variable
Prev: This marked a 7% increase on the previous year and the reversal of a steady five-year downward trend.
Next: These have adapted to the environment by the development of long taproots that penetrate downward until they approach the assured water supply provided by groundwater.
