Plates are puzzle-piece like sections of the lithosphere that move over the asthenosphere, carrying pieces of continental and oceanic crust. which statement about the plates can geologists assume is true? a.)the plates are less than 70 km in thickness. b.)the plates assist in forming earth’s magnetic field. c.)the plates are denser than the oceanic crust. d.)the plates experience little pressure from the weight of rocks.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?