the.com/desert

a furnace that freezes at night and hoards more secrets than it shows water

means A barren, dry region where little rain falls and few plants grow — typically sandy or rocky and sparsely inhabited.

from From Latin desertum, 'a thing abandoned,' the past participle of deserere, 'to forsake' — de- ('un-') plus serere ('to join or bind together'). So at root a desert is literally a place that has been left behind, unbound from the company of living things. It reached English through Old French desert. Note the same Latin source gives us 'desert' as in 'just deserts' (what one deserves) — a separate sense entirely, and worth not confusing with the dry waste.

night chill
Sahara temperatures can plunge below freezing after dark
growing
Deserts expand yearly through desertification, eating arable land
underwater past
The Sahara was once green with rivers and lakes
definition
Defined by dryness, not heat; Antarctica counts too
life thrives
Specialized creatures survive months with no drinking water
for instance

sahara — world's largest hot desert at 9 million square kilometers spanning north africa

antarctica — world's largest desert by area at 14 million square kilometers, coldest and driest continent

kalahari — semi-arid sandy savanna covering 900,000 square kilometers in southern africa

atacama — driest non-polar desert in chile with some areas never recording rainfall

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