Which one of the following is true for anticlines but not for synclines? a. the deeper strata are buckled upward along the fold axis. b. the limbs dip or are inclined towards the fold axis. after erosion, c. the younger strata are exposed along the axial region of the fold. d. some may be asymmetric and some may have plunging axes.

The correct answer is letter A.

An anticline and a fold with its concavity facing downwards, and at its core are older rocks or extracts.

A syncline is a fold with the concavity facing upward, displaying layers that hang toward the center of the structure.

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.