The least abundant gas in out atmosphere is Carbon dioxide at 0.03%.
Answer: After Germany annexed Austria in March 1938 and particularly after the Kristallnacht pogroms of November 9–10, 1938, nations in western Europe and the Americas feared an influx of refugees.
Explanation:
Answer: Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks.
Explanation:
It was first detected by Robert Wilson and Arno Penzias.