Water from limestone and sandstone aquifers is generally better to drink than water from sand and gravel aquifers | Sand and gravel aquifers tend to contain less groundwater than limestone or sandstone aquifers | Groundwater in deep aquifers is more likely to be recharged than groundwater in shallow aquifers | Sedimentary rocks, because they are porous, are not capable of storing large amounts of groundwater |
托福14天冲刺微信战团