Answer:
4 billion years
Explanation:
Scientists have found the oldest known rocks on Earth. They are 4.28 billion years old, making them 250 million years more ancient than any previously discovered rocks. Earth formed about 4.6 billion years ago from a disk of gas and dust circling the sun.
Answer: Machu Picchu is located In the Andes Mountain range in Peru.
The country with number of hydroelectric projects underway is Pakistan.
<h3>What is hydro electric power?</h3>
Hydroelectric power are energy that are generated using water.
They covert energy form a flowing water into electrical energy.
Pakistan have made use of hydroelectric power but still have proposal on developing new hydropower.
Therefore, The country with number of hydroelectric projects underway is Pakistan
Learn more on power here,
brainly.com/question/24858512
I think unplugging DVD players
Answer:
volcanic outgassing - carbon dioxcide
comets and meteoroids - icy debris
major component of modern atmosphere - nitrogen
