Which type of slope movement occurs on steep slopes and is characterized by relatively straight scree?

The movement characterized by straight scree on steep slopes is known as a fall. This process involves the rapid downward movement of rock and debris due to gravity, typically occurring in steep terrain where the material dislodges and falls freely. The nature of falls allows the material to maintain a relatively straight path as it tumbles down, which contributes to the formation of scree—loose stones that accumulate at the base of steep slopes. This process emphasizes the dynamic and unstable conditions present on steep slopes, often exacerbated by factors such as weathering or erosion that weaken the material.

In comparison, slides involve a more coherent mass of material moving down a slope along a defined plane, which can lead to a more structured and less chaotic appearance than that of falls. Flows, on the other hand, are characterized by the movement of material in a fluid-like manner, often including a mix of water and debris, which does not fit the criteria of relatively straight scree. Creep is a very slow process of soil and rock movement down a slope that results in less noticeable changes and does not typically produce the abrupt and angular features associated with falls.