It was called The Great Depression.
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You are possibly looking for Caldera.
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The lines for depression are called hachured lines
The lines for depression are called hachured lines
Recession or depression
Cone of depression
Maniac depression is now called bipolar disorder.
A valley or a basin or a gully, or perhaps a swale or a depression.
because depression is difficult to recognize
a worldwide economic crisis called the long depression
If it goes on for a long time and no one buys a lot of stocks, it could eventually turn into a depression. Save