Environmental and Soil Science Flashcards
In the atmosphere around the Earth, air is composed of approximately ______% Nitrogen, ______% Oxygen, and ______% mixture of other gasses
78%, 21%, 1%
The chemical makeup of water is ________.
H2O
A buildup of heat from sunlight rays passing through a clear object and the resulting heat being trapped inside is known as the ____________.
GREENHOUSE EFFECT
Water has been described as the ____________ a substance that dissolves or otherwise changes most other materials
UNIVERSAL SOLVENT
The water that drains out of soil after it has been wetted to feed wells and springs is called ____________ water or free water.
GRAVITATIONAL
____________ water is water that remains after gravitational water has drained away, and this water can be taken up by plant roots.
CAPILLARY
____________ water is held too tightly by soil particles and cannot be absorbed by the plant.
HYGROSCOPIC
Land erosion is the process of wearing away of soil and is a serious problem worldwide. Both ________ and ________ are capable of eroding soil.
WIND and WATER
Crop ____________ is the planting of different crops in a given field every year.
ROTATION
A ____________ is a soil or wall structure built across a slope to capture water and move it safely to areas where it is not likely to cause erosion.
TERRACE
Class ____ soils are suitable for cultivation, have few limitations that restrict their use, do require good soil management practices, and are the best for cultivating crops
I
Class ____ soils are not suitable for cultivation. Soils and geologic features have limitations that nearly always prevent their use for agricultural production.
IV
Class ____ soils are suitable for cultivation, have severe limitations that reduce the choice of plants, require careful management, or both, and are useful for only perennial vegetation and infrequent cultivation.
VIII
Fine mineral particles are called ________, and they are the smallest soil particles.
CLAY
Medium sized soil particles are called ________.
SILT
