The sahara desert has an area of approximately 9 400 000 km^2. while estimates of its average depth vary, they center around 150 m. one cm^3 holds approximately 8 000 grains of sand. a. approximately how many grains of sand are in the sahara desert? b. what fraction of the sahara is made by 1 grain of sand? c. a small dump truck can carry approximately 20.5 m^3 of sand. suppose a long line of dump trucks were to dump a load of sand every 30 seconds. how many years would it take to re-create the sahara desert?

a). grains

b).

c). years

Step-by-step explanation:

a). Given Sahara desert has an area of approximately = 9400000 km²

= 9400000×(10000000000) cm²

= cm²

Depth of the desert = 150 m

= 15000 cm

Volume of desert = Area × Depth

=

= cm³

Since 1 cm³ holds sand grains = 8000

Therefore, Grains in Sahara Desert =

=

b). Since 1 cm³ = 8000 grains

1 grain = cm³

c). A truck can carry sand = 20.5 m³ Or

= cm³

Now time taken to recreate Sahara Desert = seconds

=  

= seconds

= years

= years

a. the residual plot for model 1 has a random pattern and is a good fit for the data.