Which allowed scientists to determine that Earth was at least 4.3 billion years old?(1 point)
the electrical conductivity of uranium ions
chemical reactivity of zircon ions
magnetic field surrounding zircon
the radioactive decay of uranium to lead
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the answer is the radioactive decay of uranium to lead
the other answers are:
# 1. the radioactive decay of uranium to lead
# 2. the composition of moon rocks and some earth rocks are similar
# 3. 4.6 billion years ago
# 4. Its hydrogen atoms are heavier than others
# 5. earth surface is constantly changing
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Which deductive reasoning provides evidence contradicting the idea that the Earth's core is solid?
(1 point)
Responses
Earthquakes consist of both P and S waves.
Earthquakes consist of only S waves..
After a major earthquake in 1960, scientists around the world detected S and P waves.
After a major earthquake in 1960, some scientists around the world did not detect S waves.
The answer to the question, "Which allowed scientists to determine that Earth was at least 4.3 billion years old?" is the radioactive decay of uranium to lead.
To understand why, we need to look at a process called radiometric dating. This method enables scientists to estimate the age of a rock or mineral by measuring the ratio of radioactive isotopes to their decay products. In the case of determining the age of the Earth, scientists use the decay of uranium isotopes to lead.
Uranium is a naturally occurring radioactive element found in rocks and minerals. It has several isotopes, including uranium-238 and uranium-235, which are unstable and undergo radioactive decay over time. The process of radioactive decay involves the conversion of the parent isotope (uranium) into a stable daughter isotope (lead) through a series of intermediate decay products.
By measuring the amount of uranium and lead isotopes in a sample, scientists can determine the age of the sample based on the known rates of decay for uranium isotopes. This method provides a way to estimate the ages of rocks and minerals, including those that make up the Earth's crust.
Therefore, the radioactive decay of uranium to lead is the key process that allowed scientists to determine that Earth is at least 4.3 billion years old.