Realizing that rattles make a noise, a 4-month-old infant laughs with delight when his mother puts a rattle in his hand. this infant is displaying a reaction.

secondary circular

Explanation:

Secondary circular reaction: In psychology, this is one of the sub-stages of the sensorimotor stage which is a part of the cognitive development theory and it was given or introduced by Jean Piaget.

The secondary circular reaction tends to start from four months of age in an individual's life and lasts through eight months of age. In this sub-stage, a child tends to become focused towards the world or environment around him or her and therefore he or she tends to repeat few things just to trigger a particular response in the surrounding environment.

The given statement of the question above states that the infant is displaying a secondary circular reaction.

to plan an idea out before

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)