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Rocks and Soil

Soil with the tiniest grains of rock
a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals
an issuing forth suddenly and violently; outburst; outbreak
a natural elevation of the earth's surface rising more or less abruptly to a summit, and attaining an altitude greater than that of a hill, usually greater than 2000 feet
Particles in the soil that finer than sand but coarser than clay
unbroken solid rock, the bottom layer
Soil with grains large enough to see with your eyes
Liquid rock
any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint
mineral or organic matter deposited by water, air, or ice. It settles to the bottom.
Decayed organic matter
produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma
The best soil for most plants. it contains almost equal parts of sand, silt, and clay and humus.
a hollow stone often lined with crystals