1. which layer is most responsible for the movement of continents?

a. the outer core
b. the asthenosphere
c. the mantle
d. the continental crust
2. what is the main cause of earthquakes and volcanic eruptions?
a. the melting of oceanic crust
b. the continental crust cracking in a given location
c. collisions between tectonic plates
d. friction between the the mantle and the asthenosphere

As water is cooled from 4 c to 0 c its density

The magnitude of an earthquake is typically calculated according to the scale.           a. mercalli   b. fujita   c. richter   d. saffir-simpson  

The distance a car travels between the time the driver decides to stop the car and the time the driver puts on brakes is called the reaction distance. how does the reaction distance change with speed? a. reaction distance decreases with with speed b. reaction distance stays the same with speed c. reaction distance increases with speed. d. there is not enough information to answer the question