<span>Good Morning!
The performance of Negroes on the fronts of the various belligerent countries in the First World War provided a new perspective on blacks. It is worth noting, however, that until the mid-twentieth century, public policies still reduced rights and humiliated black people only by their skin color or origin.
Hugs!</span>
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.
Answer:
Richie Havens
Explanation:
Richie Havens (known for the song Here Comes the Sun) was the first perfomer at the Woodstock Festival in 1969.
Thomas Jefferson and others who had led the effort to create a new nation in the former British colonies had long sought to expand the nation’s nascent borders.
They use it to sway an opinion
