Rocks discovered on the moon are similar to those found <span>near volcanoes. Two other options don't fit, as there's no such conditions on the moon.</span>
Answer:
About 30.17 years
Explanation:
About 94.6% decays by beta emission to a metastable nuclear isomer of barium: barium-137m . The remainder directly populates the ground state of barium-137, which is stable.
Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
The mass of the object can also be determined if the density and volume of an object are known.
