Answer:
B. one fourth of the original substance
Explanation:
a substance's half life is how long it takes for half of the atoms in the substance to chemically decompose. once it's half life has been completed, it will start again with the remaining material. after 6000 years, only half of the material will remain, after 12,000 years a quarter wil remain, after 18,000 years an eighth will remain, etc.
Answer:
negative rates of natural increase
Explanation:
The longest river is The Yangtze River in China is the longest river in Asia.<span> It flows for 3,915 miles, or 6,300 kilometers. This length makes it the third-longest river in the world after the Nile and the Amazon.</span>
Co-Creation Theory
One idea says the Earth and Moon formed
side-by side out of the same dust and gas. Over time, their close
proximity might have caused the Moon to fall into orbit around Earth.
Why: Makes logical sense... and i have always known this one theory...
-Lex