For the cohesive soils , there are two main internationally accepted size limits, which limits are for silt ?（）

A. From 0.02mm to 0.002mm
B. From 0.2mm to 0.002mm
C. From 0.2mm to 0.005mm
D. From 0.075mm to 0.002mm

For non-coherent soils such as gravels, what kind of soil structure does it usually form? （）

A. Massive structure
B. Single grain structure
C. Layer structure
D. Blocky structure

What is the main cause of consolidation settlement of building?

A. Wind
B. Ground water
C. Load
D. Plant

In generally, soil is composed of（）、（） 、and（） .

（）is the basis of soil mechanics, since it decides whether a soil is frictional or cohesive .

In terms of engineering, soils differ in different locations because they are influenced by five soil formation factors.Those factors are （）, （）, （）, （）and （）.

What are other causes of settlement apart from consolidation due to load?