Question

the u - shaped valleys found in mountainous regions are typically formed by: * 1 point
rivers
wind
glaciers
groundwater
when a river slows down, which process is most likely to occur? * 1 point
increased erosion
increased deposition
decreased weathering
increased mass movement
what conservation practice involves plowing fields along the contours of a hillside rather than up and down the slope? * 1 point
crop rotation
contour plowing
terracing
strip - cropping

Explanation:

• First question: U - shaped valleys are formed by glaciers. Glaciers erode the landscape through processes like plucking and abrasion, creating these characteristic U - shaped forms. Rivers typically form V - shaped valleys. Wind erosion creates features like sand dunes. Groundwater is more associated with features like caves.
• Second question: When a river slows down, it loses energy. Since the energy of a river is related to its ability to carry sediment (by processes like traction, saltation, and suspension), when the energy decreases (due to slowing down), the river can no longer carry as much sediment. So, it deposits the sediment it was carrying, leading to increased deposition. Increased erosion would require more energy (e.g., faster - flowing water). Weathering is a different process (breakdown of rocks) not directly related to river speed in the same way. Mass movement is related to gravity - driven movement of soil and rock on slopes, not directly to river slow - down.
• Third question: Contour plowing involves plowing along the contours of a hillside. This helps to slow down water runoff (as water has to follow the longer, winding path of the contour) and reduce soil erosion. Crop rotation is about changing the crops planted in a field over time. Terracing is creating flat areas (terraces) on a slope. Strip - cropping is planting different crops in strips.

Answer:

1. Glaciers
2. Increased deposition
3. Contour plowing