Author Question: Clays play a role in land subsidence by ____. a. weighing down organic material and compacting it, ... (Read 130 times)

V@ndy87 · **on:** Jul 13, 2018

Clays play a role in land subsidence by ____.
a. weighing down organic material and compacting it, causing subsidence
b. swelling and causing runoff and subsidence in adjacent areas
c. absorbing moisture to counteract subsidence
d. blocking the absorption of groundwater by the aquifer, making subsidence likely downstream
e. collapsing into compact layers when dried, increasing subsidence

Question 2

The decomposition of peat layers in soils ____.
a. releases sodium bicarbonate into groundwater
b. can result in flooding in land drained for farming
c. is usually caused when the peat layer is exposed by digging or tilling
d. happens during abnormally dry seasons
e. transforms the peat into clay