What Is the Origin of the Helium That Can Be

question 35

Multiple Choice

What is the origin of the helium that can be used to date the surfaces of basalt lava flows?

• A)It forms by the decay of uranium atoms in the lava.
• B)It is gas that was trapped during melt formation in the mantle.
• C)It is formed by interaction of cosmic rays with atoms in the lava.
• D)It is released from the ground beneath the hot lava.

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