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amoeba a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope.
bacteria microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes.
bedrock the solid layer of rock in the earth's surface, found beneath soil, sand, or gravel.
blacken to harm; soil. [1/3 definitions]
bulldozer a tractor with a large blade attached to the front that pushes or lifts soil or rocks.
clover a common plant that has leaves in groups of three and small, rounded flowers. Clover is often grown in fields to help enrich the soil.
compost a mixture of decaying leaves, vegetables, or manure that is used to improve garden soil.
conservation the protection of natural resources, such as soil, water, or forests, from loss, pollution, or waste. [1/2 definitions]
cultivator a machine or hand tool that prepares soil for planting by loosening the soil and removing weeds.
delta a triangle of sand and soil deposited at the mouth of some large rivers. [1/2 definitions]
dirt loose earth or soil. [1/2 definitions]
dirty to make dirty; soil. [1/6 definitions]
dust tiny, dry pieces of soil, dirt, or other material. [1/3 definitions]
earth soil or dirt. [1/4 definitions]
earthen made up of earth, soil, or dirt. [1/2 definitions]
earthworm a long worm made up of many segments that loosens the soil by making tunnels.
environment all the things together that surround animals and humans in the natural world, including the air, the water, and the soil (preceded by "the"). [1/3 definitions]
fertilizer a natural or chemical substance added to soil to make it better for growing plants.
grub to dig in the soil; to look for something as if by digging [1/3 definitions]
hoe a garden tool with a thin, flat blade at the end of a long handle. It is used for breaking up the soil and removing weeds. [1/2 definitions]
humus a material that is made up of partly decayed leaves and plants. Humus adds nutrients to soil and helps it hold water.