Answer: The flowing of rivers is not associated with areas of karst topography
underground topography is known as karst land forms Erosion
.The word karst originates from “kras” which is a plateau and it means barren land. Erosion is the transportation of material that have been broken down by weathering ( a process of breakage of rocks)
. There are various agents of erosion the primary agents are water wind ice glacier and groundwater (underground topography)
ER → ER-to-Golgi transport vesicles → Golgi cisternae → secretory or transport vesicles →cell surface (exocytosis) (see Figure 17-13). Small transport vesicles bud off from the ER and fuse to form the cis-Golgi reticulum.
