population pyramid is a way to visualize two variables: age and sex. They are used by demographers, who study populations. A population pyramid is a graph that shows the distribution of ages across a population divided down the center between male and female members of the population.
Answer:A population pyramid is a way to visualize two variables: age and sex. They are used by demographers, who study populations. A population pyramid is a graph that shows the distribution of ages across a population divided down the center between male and female members of the population.
The global temperature records show the fluctuation of temperature from ocean to landraces and varying extremes. These have existed since the 1850 period when measured from the Pleistocene ice age by the use of various tools and techniques like the weather balloon radioscopy.
Tree ring and ice core data have shown a measuring record from 1000 to 2000 years of data, based on lake sediments, cave deposits and fossils records. The global mean surface temperatures have ranged for over 25 years of span with periods of little ice age and medieval warm periods.
Towns grew up along the rivers which had access to the sea. Rivers also provided protection from invaders. Farmers grew crops in the fertile fields that surrounded the towns. The lack of mountains was good for farming, but it made the towns easier to be invaded by enemies.
That is a list of all basic elemental materials on our planet. Because of gravity, matter (comprising all solids, liquids and gases) does not leave the system.
