The ___ is a soil classification system that indicates the quality of soil as a construction material.

___ is the soil moisture value at which maximum dry density is reached.

4. A(n) ___ is a field soil test that measures moisture content and density of compacted soil with a portable nuclear gauge.

5. A(n) ___ is a soil that remains in a compacted state after a weight is removed.

6. A(n) ___ is an inorganic substance comprised of a solid crystalline chemical element or compound that is commonly extracted from the earth.

Soil particles greater than 3" are classified as ___?

8. During operation, the lower end of a vibratory rammer moves up and down approximately ___".

9. ___ is fertile soil produced by decomposition of plant and/or animal matter.

10. ___ is soil that remains near the site of the original decomposed rock.

11. A(n) ___ is one trip over the soil with soil compaction equipment.

When conducting a sand-cone test, a hole approximately 6" in diameter and ___" deep is dug in compacted soil.

13. ___ is the continued application of soil compaction equipment after the desired density has been achieved.

14. ___ force is the outward force produced by a rotating object.

15. Soil particles with a(n) ___ mass respond favorably to high vibration frequencies.

The soil compaction machine component that produces high-frequency vibrations through unbalanced eccentric weights on a rotating shaft is the ___.

___ soil consists of all cohesive or all granular soil.

The thickness of a layer of loose soil to be compacted is a(n) ___

A(n) ___ is a narrow excavation that is 15' wide or less made below the surface of the ground in which the depth is greater than the width.

___ is the use of a portable protective device capable of withstanding forces from a cave-in.

___ is the process of cutting back trench walls to an angle that eliminates the chance of collapse into the work area.

___ remote control is a method of controlling machine functions using invisible radiation.

A horizontal support member used to hold trench sheet piling is a(n) ___?

___ is planks used to retain earth on the side of a trench or excavation.

Vertical ___ uses opposing vertical structural members separated by screwjacks or hydraulic or pneumatic cylinders.