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Soil Review. Ms. Sanderson. The gradual rounding of the corners and edges of angular blocks of rock is called __. Unloading Exfoliation Mechanical weathering Spheroidal weathering. Spheroidal weathering. Which of the following is NOT a major component of soil?. Mineral matter Air
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Soil Review Ms. Sanderson
The gradual rounding of the corners and edges of angular blocks of rock is called __ • Unloading • Exfoliation • Mechanical weathering • Spheroidal weathering
Which of the following is NOT a major component of soil? • Mineral matter • Air • Earthworms • humus
The process responsible for moving material downslope under the influence of gravity is called __ • Weathering • Soil formation • Erosion • Mass movement
A mass movement that involves the sudden movement of a block of material along a flat, incline surface is called __ • Slide • Rockfall • Flow • slump
The atmospheric gas that forms acid rain when dissolved in water is __. • Carbon dioxide • Sulfur • Oxygen • aluminum
Why can the removal of vegetation trigger mass movement? • The plant roots lubricate the loose sediment • The plant roots bind the soil & regolith together • The soil loses nutrients and begins to crumble • The shaking triggers mass movements
The downward movement of a block of material along a curved surface is called a(n) ___.
In the process of ___, water freezes and expands, enlarging cracks in rocks.
The process that occurs when physical forces break rock into smaller pieces without changing the rock’s chemical composition is called __. • Chemical weathering • Differential weathering • Mechanical weathering • erosion
Which of the following is the result of chemical weathering? • A rock that has been split in two • A rock that has been changed into one or more new compounds • A rock that has been broken into tiny pieces • A rock that has lost its outer layers
In a well-developed soil profile, which horizon is the uppermost layer? • The A horizon • The B horizon • The C horizon • The parent horizon
The process called __ involved physical forces that break rock into smaller pieces.
What is the force behind mass movement? • Gravity • Moving ice • Flowing water • The sun’s energy
One of the most dramatic triggers of sudden mass movement is a(n) __.
When a block of material moves downslope along a curved surface, the type of mass movement is called ___. • Creep • A rockslide • A rockfall • A slump
Which of the following weathering processes involves the constant freezing and thawing of water? • Exfoliation • Spheroidal weathering • Unloading • Frost wedging
A large pile of debris that forms at the base of a slope is called __.
The layer of rock and mineral fragments produced by weathering, and covering nearly all of Earth’s land surface, is called __.
What factor commonly triggers mass movement? • Removal of vegetation • Earthquakes • Saturation of the surface materials with water • All of the above
How are the soil horizons ordered from the top of the profile to the bottom? • A, B, C • C, B, A • A, C, B • B, C, A
The B horizon is also called the __ • Partially altered parent material • Topsoil • Subsoil • Unaltered parent material
The downslope movement of rock, regolith, and soil under the direct influence of gravity is called a(n) ___.
The process that changes rock into one or more new compounds is called _____.
A soil’s texture is determined by __ • Particle size • Water content • Type of humus • Mineral composition
Which of the following is NOT associated with mechanical weathering? • Biological activity • Frost wedging • Unloading • Reactions with oxygen