2. caves—an
empty place under the ground, often with an opening in the side of a hill
3. igneous—rocks
that formed when magma or melted rock
from deep inside the earth rises and cools
4. limestone—sedimentary
rock where most caves are formed
5. metamorphic—rocks
that change due to heat and pressure
6. sedimentary—pieces
of sand, clay and dirt that are pressed together to form layered rocks
7. delta—land
made up of soil that a river has carried and left at the place where the river
flows into the sea
8. dune—hil
of sand piled up by the wind
9. floodplain—low,
flat land along a river that may be underwater during a flood
10. glacier—a
huge, slow moving mass of ice
11. island—a
body of land surrounded on all side by water
12. mountain
range—a group or chain of mountains
13. sinkhole—large
hole in ground formed when the roof of a cavern collapse
14. stream—a
small body of running water over the earth’s surface
15. valley—the low land between hills
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