As children watched, dr. vallance poured the same amount of juice into two identical glasses. then she poured the juice from one of those glasses into a taller, narrower glass. when asked which glass now has more juice, children in the concrete operational stage say that?

That both glasses have the same amount of juice

Explanation:

Jean Piaget developed a theory that focuses on cognitive development, according to him, we go through different stages in our cognitive development since the moment we are born, this stages are qualitatively different (from one to the other).

Piaget's four stages of cognitive development are: sensorimotor stage, preoperational stage, concrete operational stage and formal operational stage.

Concrete operational stage takes place between 7 and 11 years, and one of the most important milestones in this stage is the concept of "conservation": this term refers to the ability that allows a person to determine that a certain quantity will remain the same despite adjustment of the container, shape, or apparent size.

Piaget actually made this experiment with children in the preoperational stage and children in the concrete operational stage where he would pour the same amount of liquid into identical glasses. Then he would pour the juice from one of the glasses into another taller, narrower glass. Younger children would say that the taller glass contained more liquid because it's taller (focusing only on one dimension), while the kids on the concrete operational stage would say that the liquid remained the same and that he just changed the container.

In the example, Dr. Vallance did the same experiment Piaget did, since concrete operational stage children have developed the concept of conservation, they will say that the amount of juice is the same in both glasses.

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)