Sedimentary rocks at Grand Canyon are sandstone , shale and limestone.
Penicillin was discovered almost by accident. Returning from holiday, Fleming removed the tops from some old petri dishes and noticed that the bacteria he had grown were being killed by a mould - penicillin. He used the word antibiotic to describe penicillin.
The answer for your question is A
During the year 1961, the Soviet Union attempted to take over West Berlin. They formed a blockade around West Berlin, which turned out to be an awful decision, diplomatically speaking. The Soviets demanded immense atonements from the Germans, and they also wanted a neutralized phase of Germany.
Hope my answer has come to your help.
Answer:
Considering the available options, one central idea in Martin Luther King Jr.'s "I Have A Dream" speech is "All men are brothers."
Because the speech was specifically made to let the world, especially the white Americans understand that racial discrimination and prejudice are bad.
He wanted to let them known that every human being is equal regardless of the color of their skin or race.