Assertion: lithosphere's crust | /r/CapableOf | underlie northern plains
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Source sentences:
text: Important observations to take into account when considering its origin include the following: (1) The northern plains and southern highlands have distinct thicknesses, (2) the crust underlying the northern plains is essentially the same age as the crust of the southern highlands, and (3) the northern plains, unlike the southern highlands, contain sparse and weak magnetic anomalies.