I’m not sure but I think it’s the second one
Answer:
These atoms will decay as the rock ages, and by measuring the ratio of radioactive isotopes within the rock, scientists can figure out how long it has been around. In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating.
On June 17, 1775, early in the Revolutionary War the British defeated the Americans at the Battle of Bunker Hill in Massachusetts.
It was way to harsh on the Germans. It made them take full responsibility for the war and set up the stock market crash and brought the world into a depression. And pretty much was one of the may causes for world war 2
The Russian empire under Tsar Nicholas ii changed her focus from the lost Manchuria and Korea region to the Balkans states. This renewed an old rivalry with the Austria Hungary empire which also had a distinctive interest in the region. while the war was declared on Siberia, after the assassination of Ferdinard and his wife Sophie, the main target of the war was Russia.