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)****
looks good
To check your answers for these questions, let's go through them one by one:
1. Which allowed scientists to determine that Earth was at least 4.3 billion years old?
Your answer: A. The radioactive decay of uranium to lead
This is correct! Scientists use the radioactive decay of uranium to lead to determine the age of rocks. Uranium has a known rate of decay, so by measuring the ratio of uranium to lead in a rock sample, scientists can calculate the age of the rock.
2. Which evidence of the giant impact theory suggests that Earth and the moon may have once been in the same place?
Your answer: C. The composition of moon rocks and some Earth rocks are similar.
Correct again! The composition of moon rocks and some Earth rocks being similar is evidence that supports the giant impact theory. This theory suggests that a Mars-sized object collided with the young Earth, causing debris to be ejected into space and eventually forming the moon.
3. How long ago do scientists think the solar system formed?
Your answer: D. 4.6 billion years ago
Great job! Scientists believe that the solar system formed about 4.6 billion years ago. This age is determined through various dating methods, including the analysis of meteorites and samples from the moon.
4. Why is deuterium oxide called "heavy water"?
Your answer: D. Its hydrogen atoms are heavier than others.
Correct once again! Deuterium oxide, or heavy water, is called so because it contains a heavy hydrogen isotope called deuterium. Deuterium has an extra neutron, making it heavier than the regular hydrogen isotope.
5. Why is it hard to find the age of Earth?
Your answer: D. Earth's surface is constantly changing.
That's correct! It is indeed challenging to determine the exact age of Earth because its surface is constantly changing due to processes like erosion, tectonic activity, and volcanic activity. This makes it difficult to find rocks or other materials that have remained undisturbed for billions of years.
You did a great job! All of your answers are correct based on the given options. Keep up the good work!
Your answers are correct! Well done!
A. The radioactive decay of uranium to lead is the method used by scientists to determine the age of Earth.
C. The composition of moon rocks and some Earth rocks being similar is evidence of the giant impact theory suggesting that Earth and the moon may have once been in the same place.
D. Scientists believe that the solar system formed 4.6 billion years ago.
D. Deuterium oxide, or "heavy water," is called so because its hydrogen atoms are heavier than others.
D. It is hard to find the age of Earth because Earth's surface is constantly changing.