Which three observations are caused by plate tectonics? Similar fossils are found in Australia, Africa, and Asia.
Earthquakes occur frequently on the west coast of the United States.
An ocean current flows northward along the east coast of the United States.
There is a long string of underwater volcanoes in the Pacific Ocean.
The sand dunes in the Sahara Desert in Africa move across the landscape.

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

Which is an example of a reversible physical change?