3. upon what age of earth do most scientists agree?\n4.56 thousand years old\n45.6 million years old\n4.56…

3. upon what age of earth do most scientists agree?\n4.56 thousand years old\n45.6 million years old\n4.56 billion years old\n45.6 billion years old\n4. which metal that is rare in earths rocks but relatively common in asteroids is used as evidence that there was an asteroid impact at the end of the cretaceous, ending the age of the dinosaurs.\niron\niridium\nuranium oxide

3. upon what age of earth do most scientists agree?\n4.56 thousand years old\n45.6 million years old\n4.56 billion years old\n45.6 billion years old\n4. which metal that is rare in earths rocks but relatively common in asteroids is used as evidence that there was an asteroid impact at the end of the cretaceous, ending the age of the dinosaurs.\niron\niridium\nuranium oxide

Answer

Brief Explanations:

For question 3, through radiometric dating and geological studies, most scientists agree Earth is about 4.56 billion years old. For question 4, iridium is rare in Earth's rocks but common in asteroids and is used as evidence for the end - Cretaceous asteroid impact.

Answer:

  1. 4.56 billion years old
  2. Iridium