Instructions The key words and phrases in the box at the right tell about the buffalo Rewrite the key words
and phrases under the correct headings
Appearance
1
2
5.
• feeds on grass
• dark brown fur
• calf is yellowish-
red
• huge head
• eats twigs of
willows and small
shrubs
• about 12 feet or 4
meters long
• tufted tail
• humped
shoulders
• young buffalo
called calf
• long hair covers
neck and hump
• one calf each year
• calf born in May
or June
Young
1
2
3.
Food
2
2

no one should discriminated against because he or she is not from a minority group

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)

elastic potential energy