Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

The surface _____ the desert (range) _____ from large areas of sand dunes (erg), to stone plateaus (hamadas), gravel plains (reg), dry valleys (wadis), and salt flats.

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

The Sahara Desert / be/  world's largest hot desert, / locate / North Africa.

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

The only permanent river that (cross)  _____ the ecoregion is the Nile River, which (originate) _____ in central Africa and (empty)_____ northwards into the Mediterranean Sea.

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

Some mountain ranges/ rise up/ the desert/ and/ receive /more rainfall / cooler temperatures. 

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

The Sahara Desert ecoregion (cover) _____ an area of 4,619,260 km2, (surround)_____on the north, south, east, and west by desert ecoregions with higher rainfall and more (vegetal)_____

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert.

Some areas / encompass / vast underground aquifers/ resulting / oases, while other regions severely /lack / water reserves.

Complete the following sentences by giving correct form of verbs and adding prepositions to make meaningful sentences about Sahara desert. 

Local (inhabit) _____ protect themselves (to/in/from/on)_____the heat, the sunshine, the dry air, the high diurnal temperature ranges by (cover) _____their heads, such as the cheche garment worn by Tuareg.