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TByrd Science

Rocks & Soils 3rd Grade Review

TermDefinition
What are the three types of soil? Sand, Silt, and Clay
What are the differences between the types of soil? Partical size.
Humus Small bits of dead plant and animal remains.
Sand has largest particle size. Rough to touch. The color depends on the kinds of minerals in it. Allows water to pass through easily.
Clay Smallest particles. Sticky and smooth. It can be different colors. Hard for water to pass through easily.
Silt Particles are larger than clay, but smaller than sand. Feels smooth. It holds little water. Rivers carry it. When water floods the land, this is left behind.
Loam Mixture of sand, silt, clay and other materials. It is very good for growing plants. It is used as potting soil.
What are the three kinds of rocks? Igneous Rock, Sedimentary Rock, and Metamorphic Rock
Igneous Rock Rock formed from hot, melted material that is found below the surface of the Earth.
Magma Hot melted material below the Earth.
Lava Hot melted material above the Earth’s surface.
Sedimentary Rock Rock made up of tiny bits of rocky material.
Metamorphic Rock These rocks may be igneous or sedimentary rock which change due to heat and pressure.
classification Grouping objects into two groups based on whether they have some property or not.
observation Something you detect through the use of one or more of your senses.
inference When you make a guess about what happened based on observations and what you already know.
prediction An idea about what will happen in the future with an explanation of why.
testable question A question in which an experiment is needed to find an answer.
measure To compare an unknown amount with a known unit to determine its dimensions, mass, capacity, temperature, speed, quantity, or extent.
scientific observation An observation in which the result will always be the same.
variable A factor that is deliberately changed in an investigation.
temperature A quantitative property that tells how mch heat something has.
communicate To use written or spoken words, graphs, demonstrations, drawings, diagrams, or data tables to share information and ideas with others.
unscientific observation An opinion, everyone may not agree.
sequential Placing objects or events in order according to a particular property. OR Placing objects or events in order based on what occured first, second, and so forth.
Created by: tbyrd1
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