8. which of the following statements is true? a. glacial erosion forms wide, u-shaped valleys b. mudflows are the least dangerous type of sediment flow c. mass wasting happens when sediment is carried from a low elevation to a higher one d. in saltation, acids and salt in ocean water dissolve rock minerals

The correct answer is - A. Glacial erosion forms wide, U-shaped valleys.

The glaciers are essentially large masses of ice, formed either by large mas of snow or a frozen river. Because the ice is expanding, but also the glaciers appear at higher places and slowly move towards lower parts, they contribute to a lot of erosion. The size and their weight, plus their movement and the pressure they make, the glaciers manage to erode lot of material, and by doing so, they reshape the landscape in accordance to their form, which is an elongated, river like, U-shape. Once they are melted, the glaciers leave behind them long and narrow U-shaped valleys, some of which remain as a valleys, while others are filled with sea water and formed the fjords.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

when it is at an intermediate population density