http://www.friendsofmoundsprings.org.au/wp-content/uploads/2015/11/Cross-section-of-a-Mound-Spring-simplified1.png
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I