Which one of the following statements correctly describes how stream terraces can form? Group of answer choices A temporary base
level is eliminated; the stream aggrades its channel upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream. A temporary base level is eliminated; the stream downcuts upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream. Base level drops; the stream aggrades its channel, and the former floodplain is left below the present elevation of the stream. Base level rises; the stream downcuts, and the old floodplain is left well above the elevation of the present-day channel.
Explanation: A stream terrace basically forms through this process– Temporary base level is eliminated; the stream downcuts upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream.
A temporary base level is eliminated; the stream downcuts upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream.
Explanation:
The formation of steam terraces occurs when streams move down into floodplains, leaving behind some remnants of older floodplain as steps in the form of benches along the valley sides. A temporary base level is eliminated; the stream downcuts upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream.
The ability of flight allows them to migrate to different plants if needed. They can only leave a plant and walk away if there is a predator or if their food source's quality has deteriorated, otherwise they remain on their original host plant until then.
