How can people change a beach? is the changes or harmful?

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above