Explain the main functions of the roots

What is thought to have caused the mass extinction at the end of the cretaceous period?

What was the land like over 500 million years ago? what was under the sea?

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