Marla hides Ramy's favorite toy under a blanket while Ramy watches. Ramy removes the blanket and squeals when he sees the toy. Marla again hides the toy, but this time under a different blanket. Even though Ramy saw where Marla hid his toy, he still looks under the first blanket and not the second one. Ramy has displayed:

the A-not-B error Correct

Explanation:

The A-not-B error is also known perseverative error. It is known to be an error linked to mental perception. This is usually common in infants within the age range of 0-10 months, which shows that infants have not developed a permanent understanding of an object.

This theory was explained by Jean Piaget. He made it known that , this error usually occurs during the substage 4 of the infants sensorimotor stage. In this stage, the infants not yet,i.e, adjusting to fit new information and experience. At the stage also, the infant will begin to gain knowledge from the physical actions they perform.

In this case, Ramy is still at this stage, where he is still adjusting to fit new information and experience.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

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)