If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis ?

What pattern of migration do whales follow?

How does the diagram explain ocean currents? earth tilt 23.5 degreesquestion 1 options: earth's tilt causes uneven heating of earth which causes currents.earth's tilt causes the ocean to move because of gravity.earth's tilt and its rotation cause currents.earth's tilt causes uneven distribution of salt which causes currents.

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