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Earth
Term | Definition |
---|---|
What's soil made of? | weathered rock particles, organic mater, air, water |
What's humus made of? | decayed organic matierials in soil |
Tropical Climates | humus thin and low in minerals, not good for crops |
Soil Horizon | layered soil each with different characteristics |
Horizon A | upper soil layer: weathered rock particles and organic matter |
Horizon B | subsoil: mostly clay |
Horizon C | mostly rocks |
Climate Soil | soils with different characteristics because of climate |
Types of Climate Soil | tropical, desert, temperate, arctic |
Plants | provide organic matter |
Animals | loosen and mix soil |
Microorganisms | decompose dead (plants/animals) matter and provide nutrients |
Sedimentary Rocks | Formed by pieces of older rock mineral or plant remains. The formation depends on weathering AND erosion. Most fossils are sound here. Are formed in layers with oldest at bottom. |
Igneous Rock | forms when molten rock cools and becomes a solid |
Metamorphic Rock | forms when heat and/or pressure causes older rocks to change into new types of rocks |