Why are there so many craters on the moon and so few on earth?

Explained

Explanation:

Earth's 80% surface has been formed just 200 million years ago which makes earth surface quite young. The impact craters on earth are harder to recognize because of weathering and erosion of surface. Whereas the Surface of moon is very old,99% of the moon's surface is 3 billion year old.

The crater formed to falling debaris in those times have not been modified to lack of weathering and erosion. Moreover, moon also lacks water, atmosphere, tectonic activity.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.