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What serves as a natural "tape recording" of the history of the Earth's magnetic field reversals?

ocean floor

antarctic ice cap

coal deposits

Himalayas

In the 1950s scientists discovered zebra-like pattern of the ocean floor magnetic polarity. It turned out that the stripes of rock parallel to the mid-ocean ridge crest alternate in magnetic polarity (normal-reversed-normal, etc.), suggesting that they were formed during different epochs documenting the normal and reversal episodes of the Earth's magnetic field.

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NASA Goddard wikipedia → Tectonic movement#Magnetic striping

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Which of the following European mountain ranges will rise the most in the next century?

Carpathian Mountains

Scandinavian Mountains

Which desert has this famous "eye"?

This photo has been taken at a seaglass beach in Hawai'i. How is the sea glass formed?

from lava droplets that fall to the sea during land volcano explosions

in deepwater volcano explosions

during lightning strikes

Which river passes through or touches the borders of the large number of countries?