Answer:
A. Crests and troughs that remain stationary although the air forms them is moving rapidly.
Explanation:
The standing waves are a phenomenon that is a result of the interference of two wavelengths. The air over the mountain ranges is of high intensity as a result of temperature elevation. Fast movements of air currents produce scrambled ripples, as a result, the pattern of air crest and troughs remains static.
<span>February 29 is a date that usually occurs every four years, and is called a leap day. This day is added to the calender in leap years as a measure, because the earth doesnt orbit around the sun in exactly 365 days (1 year). The gregorian calendar is a modification of the julian calender first used by the romans. </span>
Countries were separated by continental drift
Answer:
Slave trade was abolished in Britain quite early on but there were other countries that carried on in the slave trade. Between the 15th and the 18th century, millions of slaves were transported to north and south America. Over 1.5 million of these died on the journey.
