Answer:
The Earth's atmosphere is 78% nitrogen gas or N2. Even though there is so much nitrogen in the air, there is very little in the Earth's crust. It can be found in some fairly rare minerals such as saltpeter. Nitrogen can also be found in all living organisms on Earth including plants and animals.
Explanation:
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Temperature and salinity changes the density of water.
<h3>Effect of Temperature and salinity on water</h3>
Temperature and salinity directly affect density of water. Water that low temperature is more denser than water that has high temperature while on the other hand, Freshwater which has no salt is less denser than seawater which has more salt concentration so we can conclude that temperature and salinity changes the density of water.
Learn more about salinity here: brainly.com/question/20283396
The statement that is true about the formation of Earth's oceans is that the atmosphere formed before the oceans.
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Answer:
The answer to your question is 3.75 mg
Explanation:
Data
Radium-223
half-life = 11 days
mass = 60 mg
total time = 44 days
Process
1.- Draw a chart to start the calculation
Mass Number of days Half-lives
60 mg 0 0
30 mg 11 1
15 mg 11 2
7.5 mg 11 3
3.75 mg 11 4
Total number of days 44
Mass active after 44 days = 3.75 mg