Answer:
Movement of plates bring changes in the physical features of the earth surface in the following ways.
1) When the earth plates move, formation of ocean occurs.
2) Continents are also the product of plates movement. Earthquake is also caused by plates movement inside the earth.
3) Mountain also formed due to the movement of plates. Volcanic eruptions also occurs due to plates.
Answer:
21 minutes or 0.35 hours
Explanation:
The formula for exponential population growth is

where
initial population of E.coli i.e 100
k is the rate of population growth i.e 2 as the population doubles
t is the time period i.e 20 minutes
Substituting the given values in above equation, we get -

Generation time
minutes
or 0.35 hours
Density = mass/volume
X = 10/50
X=.2