Answer:
A New Kind of Light in the Universe? “Super-Planckian” Material Emits Light That Exceeds Limits of Natural Law
C. when did the earth form? and what is it made of?
A the southwest isnt an area that is fully populated yet due to the land layout and the weather and lack of jobs
Question Options:
A. the creation of a new nation
B. the creation of a new state
C. a drastic boundary change
D. a small boundary change
Answer: He is witnessing a small Boundary Change.
A boundary change in geography is a change in a real or imaginary line or location.
The River was flowing towards the United States initially then changed towards Mexico. This is classified as a small change because he was tracking only a particular area of the
river.
Answer:
2.62 years
Explanation:
The half life of a material is the time taken for half of the number of radioactive atoms in a radioactive material to remain.
If a radioactive material is cut into pieces, each piece has the same half life as the whole material.
Hence, if Strontium-147 is cut into pieces, each piece will have a half life of 2.62 years, just as the whole material.
