What geographical feature do you think the black textured lines on this map represents?

Incomplete question. However, I provided details about how black textured lines are used in maps more commonly.

Explanation:

Remember, in maps (diagrammatic representations of a place) different colors (textures) of lines are used to represent certain objects on the ground captured in the map.

In the case of black textured lines, they are used to represent man-made objects such as bicycling paths, or other trails.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.