4th Grade Vocabulary 51-64

Vocabulary   51-64

51.  abiotic—nonliving parts of an ecosystem

52.  biotic—living or once-living things in an ecosystem
53.  earthquake—a shaking of the land that occurs when
            huge areas of rock move.
54.  ecosystem—all of the living and nonliving things in an
            environment
55.  erosion—the movement of rock particles by wind,
            water, ice, or gravity
56.  glaciers—a large, slowly moving mass of ice
57.  gradually—slowly, over a period of time
58.  portion—a part of the whole thing
59.  process—actions done in a special order
60.  reasonable—showing or using good sense and
            thinking
61.  recognize—to be aware of; notice
62.  various—different kinds; more than one
63.  volcano—an opening in the earth’s crust where
            molten lava and gasses erupt
64.  weathering—the breaking down of rocks by water,
            wind, plant, ice and chemicals