Can someone check my answers when you can please?
Which allowed scientists to determine that Earth was at least 4.3 billion years old?(1 point)
A. The radioactive decay of uranium to lead ****(My answer)****
B. The electrical conductivity of uranium ions
C. Chemical reactivity of zircon ions
D. Magnetic field surrounding zircon
Which evidence of the giant impact theory suggests that Earth and the moon may have once been in the same place?(1 point)
A. The amount of water on the moon and on Earth is similar.
B. The temperatures on Earth and on the moon are similar.
C. The composition of moon rocks and some Earth rocks are similar. ****(My answer)****
D. The type of gases in the atmospheres of Earth and the moon is the same.
How long ago do scientists think the solar system formed?(1 point)
A. 2.6 billion years ago
B. 6.2 billion years ago
C. 4.3 million years ago
D. 4.6 billion years ago ****(My answer)****
Why is deuterium oxide called “heavy water”?(1 point)
A. Its oxygen atoms are heavier than others.
B. It has extra oxygen atoms.
C. It has extra hydrogen atoms.
D. Its hydrogen atoms are heavier than others. ****(My answer)****
Why is it hard to find the age of Earth?(1 point)
A. The Earth is constantly moving.
B. There are too many layers of Earth.
C. There is no way to find the age of rocks.
D. Earth's surface is constantly changing. ****(My answer)****
1 answer
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