What is the most significant cause of ww2 and why

 there were a lot of basic reasons but the immediate reason was when Germany invaded Poland in September 1 1939.

Explanation: the basic causes were the great depression, Fascisim, Nazi party, when Japan invaded Manchuria, Spanish civil war, Versailles Treaty, the weakness of the UN, US policy of isolation, Britain and France appeasement. In 1938 the British france and Germany signed the Munich deal which allowed Germany to take parts of Czechoslovakia. and also in 1939 Germany and the USSR signed the Nazi-Soviet non aggression pact. but finally when Germany invaded Poland in September 1 1939, Britain and France declared war on Germany

- "friedan's attitude towards what she calls the 'feminine mystique' is that she sees the ideal of femininity as stiffing women's potential in the 1950's. betty friedan was a writer and activist of the 1950's and 60's."

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well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.