An elongated ridge deposit is left along the length of a continental ice sheet. One way scientists determine whether the ridge is an esker or a moraine is by:

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Scientists determine whether the ridge is an esker or a moraine by examining the sorting of the sediments and looking whether long tunnels are present. Eskers are composed of well-sorted sands and gravels and have long tunnels running through them, while moraines are composed of poorly-sorted sediments and do not have tunnels. Therefore, examining the sorting and presence of tunnels allows scientists to differentiate between an esker and a moraine.

An Elongated Ridge Deposit Is Left Along the Length of a Continental