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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
Created by: s33646