Sodium-22 has a half-life of 15 hours. How much Sodium-22 will remain in an 18.Og sample after 60 hours? (show all your work to receive full credit.) *​

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

What are fossils of organisms that existed over a wide area but only for a limited time period called?