Amass of falling and tumbling rock, debris, and soil leveling at a high velocity owing to the presence of ice or water is a:

Debris avalanche.

Explanation: Debris avalanches or debris flows is the process in which landslides in shallow form which has a been formed with mixture of water. They have a rapid speed to travel in downward motion along a slope. The flow of mud also carries bushes, rocks, debris along with it in a slope.

The main cause of this process is due to the slopes that are steep ,heavy rainfall or soil that is loose

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.

i do believe that its called,(the segovia highlands); plz check first good luck;