science 10 . need help

1. the concept that earth's upper layer, or lithosphere, is divided into large, quite rigid segments which float over the denser upper mantle, is termed
a. pushing margins
b. floating continents
c. plate tectonics
d. convection currents

2. the point where movement occurred which triggered the earthquake is the...
a. dip
b. focus
c. epicenter
d. strike

3. you are an oceanographer and want to map the ocean floor on the seat coast of the Philippines. as you do your study, you notice that there is a portion in the ocean floor which is relatively much deeper than the rest. What most likely is that deeper part?
a. linear sea
b. trench
c. oceanic ridge
d. rift valley