Athick mass of tough roots called loess kept the fertile soil of the prairies in place and held on to moisture. true or false.

The correct answer is "FALSE".

Explanation:

Loess are sediments  formed by the accumulation of silt that comprise about ten percent of the total Earth's land. Loess are not thick mass of tough roots that kept the fertile soil of the prairies in place and held on to moisture. These thick masses are known as "sod" and are usually comprised of fibrous roots where grass grows.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.