not
correct
correct for box A
(composition)
correct for box B
(importance)
correct for box C
(threats)
forms very quickly 0
may take thousands of years to form
acts as a filter to remove contaminants
from groundwater
supports biodiversity and agriculture
0
made only of rock
made of weathered rock mixed with
organic material
erosion and poor land management
1 answer
acid rain and pollution
1 answer