Answer:
Shale.
Explanation:
It is composed of silt or clay that has been compacted or squeezed together to form a solid rock.
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
1.) Coastal environments, deserts, mountain environments, savanna grasslands, and forests.
2.) Each ecosystem has a different climate and people and animals who have adapted to these climates differently than the other environments. Each environment has its own resources there that the other might not have for them to survive.
~Anything you say huh, well I say sleep well tonight!
Answer:
Explanation:
Angular momentum, L = m v r
areal velocity = 
according to kepler's 2nd law
since, we know that
areal velocity= 
now substituting value of v in areal velocity we get
hence from above equation of rate of change of area swept i.e. areal velocity is proportional to
I believe the answer is the A. mountains because since there so high little moisture from the pacific ocean can reach the desert.
