1. some areas where earthquakes and volcanic activity often occur together are along oceanic ridges where lithospheric plates move apart. if we know the age of the crust and the distance from the ridge center, we can calculate how fast the two plates are moving away from each other. look at the figures of oceanic ridges (spreading centers) a. calculate the half-spreading rate across the mid-atlantic ridge and east pacific rise. this is the rate at which one of the plates is growing.

b. determine the full spreading rate for these same ridges. this is the rate at which the ocean basins are opening

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

What layer of the atmosphere is directly above the troposphere?