Soil Identification

 These are particles larger than 75mm but smaller than 300mm.

• Cobbles

• Sand

• Boulders

• Gravel

In estimating the percentages of gravel, sand and fines, the estimate is rounded to the nearest __.

In the preparation for the identification of soils, the particles larger than __mm are removed before estimating the percentages of gravel, sand, and fines.

Soil formed by deposition in quiet lakes.

• Lacustrine

• Marine

• Alluvial

• Colluvial

Gravels are subdivided into:

• Medium and Coarse

• Medium and Fine

• Coarse and Fine

• Coarse, Medium and Fine

Clays have low dry strength and none to low plasticity

• False

• True

Silts and clays are particles passing the No. 200 sieve.

• True

• False

If the soil is estimated to contain 15% fines, give the soil a dual identification using two group symbols.

• True

• False