Define shifting agriculture

It is a subsistence agriculture practiced in vast region of dense vegetation(jungle and tropical forest). The farmers open clearings in vegetation,burn the trees,so that the ashes contribuye fertility to the soil.

i am a little confused myself with what goes with the letters and what goes with the numbers but ill do my best to you

the cordillera states and grand canyon are along the southwest u.s. and northern mexican pacific.

the great plains and southwest desert are also the prairie and home to many earthquakes too .

the coastal plains have poor soil and many factories started in the south.

is this what u needed? if not i can see what i can do