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Science Quiz

just study

QuestionAnswer
What is evidence? unbiased data gathered by direct observation
What is soil? portion of earth's surface of rock and humus which helps plants grow
What is composition? specific ingredients- general make-up of a material
What is weathering? wearing down of rocks by natural processes
What is decomposing? break down or decay living material
What is organic matter? material living organisms: plants, animals, leaves
What are nutrients? dissolve in water and are all absorbed by roots and is a certain
What is humus? rich topsoil that forms after decomposition, a good loom soil with 40% silt, 40% sand, and 20% clay
What is fertilizer? substance that supplies the soil with missing nutrients
What is a native plant? a plant that grows or lives in a particular region without direct or indirect human intervention
What is contour plowing? used on hills; plow across the hill, NOT UP AND DOWN; slows down water flow so less soil is washed away
What are tree lines? lots of trees planted to form a windbreak; slows down wind so it can't lift up soil and move it
What is crop rotation? changing type of crop planted in same location each year; reduces loss of same type of nutrients in the soil
What are native PLANTS? grasses and trees native to the area soil are best adapted to the environment; grow well and roots reduce erosion
What is control? standard to which experimental results can be compared
What are the 3 main components of soil? silt, clay, and soil
What is the order, in greatest to least: the components of soil? sand, silt, clay
What are the individual pieces of sand called? grains
Can you see clay particles? No, you need a microscope to see them.
Different soils from different places have _________________ amounts of each of the above different
What are all of the layers of soils? subsoil, bedrock, topsoil, parent material
What are the layers of soil in order? topsoil, subsoil, parent material, bedrock
Why do we need organic matter? We need it because bacteria and other microrganisms help break down and it eventually turns the chemicals into nutrients and nutrient help the soil.
What was the Dust Bowl? The Dust Bowl was 1930's natural disaster affecting many central states, removing soil, and depleted nutrients and water.
Created by: 42josie