During which period did humans first appear on Earth? Quaternary Neogene Paleogene Cenozoic

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

If your blood becomes too concentrated with iona, what will happen to the red blood cells

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.