Answer:
Explanation:pon studying the Gubbio samples, Luis Alvarez wanted to know how long the foram extinction lasted before the species began to re-establish itself. He suggested the samples be handed over for analysis to another pair of Berkeley Lab scientists, nuclear chemists Frank Asaro and Helen Michel, who had developed a technique, called neutron activation analysis, that enabled precise measurements of very low concentrations of elements. Luis believed that neutron activation analysis would help determine how long it took for the clay layer to form. To the surprise of everyone involved, the measurements by Asaro and Michel showed that the clay layer was about 600 times richer in iridium than the surrounding limestone. Iridium, a silvery-white metal related to platinum, is virtually absent from the Earth’s crust, but high concentrations are common in extraterrestrial objects, such as asteroids.
The plot thickened when this same “iridium anomaly” was subsequently discovered in clay layers at locations in Denmark and New Zealand, and later dozens of other sites around the world where the geological record of the Cretaceous-Tertiary boundaries are also complete. These iridium-spiked layers of clay also contained an abundance of soot. Comparisons of ratios between iridium and several other key elements in the clay layers indicated that the widely scattered iridium anomalies all came from the same source – one that was not of this earth.
The historical context of the times in which an event happened will help the historian to understand motives that may have influenced people's actions, as well as relationships between ideas and events occurring within a cultural time and space. Historical contexts of events in the past differ from conditions in our present context, so it is important to interpret according to context then rather than according to conditions now.
Claude Bélanger, professor of history at Marianopolis College in Canada, explains that historical context "is understood as the events, or the climate of opinion, that surround the issue at hand. They help to understand its urgency, its importance, its shape, or even its timing." Historical context includes social, political, economic, intellectual, cultural and religious trends that existed when and where the event you're studying occurred. The historian will want to assess things according to context that existed at that time, rather than judging the past according to context or standards that are in place in our own time, in order to be fair to the persons of that era.
Answer:
I think it's A. I could be wrong lol
Explanation:
Answer:
he Nanking Massacre took place over a period of six weeks in 1937, when the ... both soldiers and civilians–in the Chinese city of Nanking (or Nanjing). ... Following a bloody victory in Shanghai during the Sino-Japanese War, the ... Fearful of losing them in battle, Nationalist leader Chiang Kai-Shek ...
Explanation:
The answer is C) challenge any laws that individuals claim are unconstitutional
