Answer:
Earth's first atmosphere 4.6 billion years ago was most likely comprised of hydrogen and helium (two most abundant gases found in the universe!)
Through the process of outgassing, the outpouring of gases from the earth's interior, many other gases were injected into the atmosphere. These include:
-water vapor (produced rain - rivers, lakes, oceans)
-carbon dioxide
-nitrogen
As outgassing occurred over a period of millions of years, the atmosphere evolved to its current state
Explanation:
The ultimate source of electromagnetic waves are the radio sets. The answer is letter C. <span>One example of an
electromagnetic radiation is the visible light. And visible light can be radio
waves, infrared light and X - rays. The rays of the sun are a form of visible
light. It has an electromagnetic radiation of UV (ultra violet) rays. That is
why the radiation at day is greater than at day due to sun’s rays.</span>
Answer:B. A segment of a DNA molecule
Explanation:
That nice .................
Answer:183.52 km
Explanation:
Given
First hurricane is moving in a direction 
speed of hurricane =51 km/h
After 3 hr it changes its direction changes to North and speed decreasing to 34 km/h
Position vector of Hurricane after 3 h
After 1.5 hr position vector of hurricane w.r.t previous one
thus 
So total distance
