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— Course title
Excavation & Trenching Safety
Draft · v0.4
Last edited 14:08 · Joe
— Editing lesson · Module 02
2.1 — Cohesive vs. Granular Soil
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VIDEO_2.1_COHESIVE_VS_GRANULAR.mp4 · 8:42 · MUX-PROCESSED ✓
03:14
K1
K2
06:48
00:00
08:42
K1 Knowledge check · Mid-video · 03:14 · 1 of 2
Which soil type provides the strongest natural cohesion?
Correct
Type A — clay, silty clay, sandy clay
Highest unconfined compressive strength · 1.5 tsf+
Distractor
Type B — angular gravel, silt, silt loam
Cohesive but not strongest · 0.5–1.5 tsf
Distractor
Type C — gravel, sand, loamy sand
Granular, not cohesive · < 0.5 tsf
AI suggestionAdd a 4th distractor — "Disturbed fill material" — based on common confusion in this topic.