Can someone help me?? Which action is a result of gravity in relation to moving tectonic plates?

Earth's internal heating

circulating material in the mantle

ridge push and slab pull

Earth's magnetic field reverses

What state of matter is ice a. liquid b. element c. solid d. gas

Which of the following words describe the reality that the universe looks the same from various perspective

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.