Vocabulary+Words

=Vocabulary Words =

 Bedrock -- the solid rock found under soil  Cast -- a type of fossil that forms when mud or minerals fill a mold  Clay -- a type of soil made of very large grains; it holds water well  Decay -- to break down into component parts; rot  Erosion -- the movement of weathered rocks and land  Extinct -- no longer in existence  Fossil -- something that has lasted from a living thing that died long ago  Humus -- the part of soil made up of decayed parts of once-living things  Imprint -- fossil made from footprints or something thin like a leaf that fell into mud  Loam -- a type of topsoil that is rich in minerals and has lots of humus  Mold -- a type of fossil that takes the shape of plants and animals that were left in sediment when rocks formed  Paleontology -- the study of ancient or past life  Preserve -- to keep or maintain in an unaltered condition  Sand -- a type of soil with very large grains; it does not hold water well  Soil -- the loose material in which plants can grow in the upper layer of the Earth <span style="font-family: 'Comic Sans MS',cursive;"> Subsoil -- the middle layer of soil <span style="font-family: 'Comic Sans MS',cursive;"> Topsoil -- the top layer of soil made up of the smallest grains and the most humus <span style="font-family: 'Comic Sans MS',cursive;"> Weathering -- the wearing down of rocks

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