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Period 7
7th grade
| Question | Answer |
|---|---|
| potential hydrogen | what does pH stand for? |
| weathered bedrock, decomposed organic material | what is soil made of? |
| the loose, weathered material on earth's surface in which plants can grow | what is soil? |
| Rock is broken down by weathering and mixed with other surface materials | how is soil formed? |
| the layer of rock beneath the subsoil | what is bedrock? |
| the bedrock that was weathered, and how it was weathered | What are the two factors that determine the type of rock particles and minerals in a soil? |
| sand, silt, and clay | What are the three types of weathered rock particles found in soil? |
| the decayed organic material in soil | What is humus? |
| gravel, sand, silt, clay | what are they soil particles listed from largest to smallest? |
| it is slower in areas that are dry, and faster on limestone than granite | what are two true facts about soil erosion? |
| mixes the soil and makes spaces for air and water | what do soil organisms do to improve soil? |
| the organism that contributes the most organic remains | what are plants? |
| a loose layer created when plants shed leaves | what is litter? |
| soil organisms that turn DOM into humus | What are decomposers? |
| fungi, protists, bacteria, worms | what are the main soil decomposers? |
| do most of the work of mixing humus with other materials | what are earthworms? |
| break up hard, compacted soil and mix humus through, add nitrogen, organic materials, and aerate it | What do burrowing mammals do? |
Created by:
catathene
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