Johnny is a 4-year-old who is having lunch with his mother and sister. when his mother pours the milk that is left in the carton into the children's glasses, she finds that there isn't enough to fill both glasses; so she carefully pours half of the milk in the shorter, fatter glass into a thin, taller glass in front of johnny's sister. immediately, johnny complains that his sister got more milk than he did, and even when his mother tries to explain that they both got the same amount, johnny insisted he was right. in this example, johnny is demonstrating a lack of development in the area of

Conservation is the safeguarding or productive utilizing of assets in an effective or moral way or the preservation of different amounts under physical laws. In the physical terms preservation allude to the standard by which the aggregate estimation of a physical amount or parameter, for example, vitality, mass etc. stays steady in a framework which isn't liable to outside impact.

it's

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)