A system for drilling a wellbore, the system comprising: a drill string that drills the wellbore using a drilling fluid (162a, 162c) in the wellbore that returns rock cuttings (164, 174, 222a, 222b,..., 222n) therewith to a surface location; a separator (180, 220a, 220b,..., 220n) that separates the rock cuttings (164, 174, 222a, 222b,..., 222n) from the drilling fluid (162a, 162c) at the surface location; a weighing unit (210a, 210b,..., 210n) for receiving the rock cuttings (164, 174, 222a, 222b,..., 222n) from the separator (180, 220a, 220b,..., 220n); and a controller (190, 240) for determining the weight of the cuttings (164, 174, 222a, 222b,..., 222n) received by the weighing unit (210a, 210b,..., 210n); the system characterized by the weighing unit (210a, 210b,..., 210n) including: a movable member (212a, 212b,..., 212n) having a first longitudinal side and a second longitudinal side opposite the first longitudinal side, wherein the movable member (212a, 212b,..., 212n) substantially continuously receives cuttings (164, 174, 222a, 222b,..., 222n) from the separator (180, 220a, 220b,..., 220n), wherein the movable member (212a, 212b,..., 212n) is a belt disposed on rollers; a sensor (188, 214a, 214b,..., 214n) for providing information relating to weight of the cuttings (164, 174, 222a, 222b,..., 222n) received by the weighing unit (210a, 210b,..., 210n) while the movable member (212a, 212b,..., 212n) is moving; and a motor (230a, 230b,..., 230n) mounted at a side of the movable member (212a, 212b,..., 212n) adjacent the first longitudinal side and that moves the movable member (212a, 212b,..., 212n) to discharge the cuttings (164, 174, 222a, 222b,..., 222n) from the movable member (212a, 212b,..., 212n) at the second longitudinal side. a drill string that drills the wellbore using a drilling fluid (162a, 162c) in the wellbore that returns rock cuttings (164, 174, 222a, 222b,..., 222n) therewith to a surface location; a separator (180, 220a, 220b,..., 220n) that separates the rock cuttings (164, 174, 222a, 222b,..., 222n) from the drilling fluid (162a, 162c) at the surface location; a weighing unit (210a, 210b,..., 210n) for receiving the rock cuttings (164, 174, 222a, 222b,..., 222n) from the separator (180, 220a, 220b,..., 220n); and a controller (190, 240) for determining the weight of the cuttings (164, 174, 222a, 222b,..., 222n) received by the weighing unit (210a, 210b,..., 210n); the system characterized by the weighing unit (210a, 210b,..., 210n) including: a movable member (212a, 212b,..., 212n) having a first longitudinal side and a second longitudinal side opposite the first longitudinal side, wherein the movable member (212a, 212b,..., 212n) substantially continuously receives cuttings (164, 174, 222a, 222b,..., 222n) from the separator (180, 220a, 220b,..., 220n), wherein the movable member (212a, 212b,..., 212n) is a belt disposed on rollers; a sensor (188, 214a, 214b,..., 214n) for providing information relating to weight of the cuttings (164, 174, 222a, 222b,..., 222n) received by the weighing unit (210a, 210b,..., 210n) while the movable member (212a, 212b,..., 212n) is moving; and a movable member (212a, 212b,..., 212n) having a first longitudinal side and a second longitudinal side opposite the first longitudinal side, wherein the movable member (212a, 212b,..., 212n) substantially continuously receives cuttings (164, 174, 222a, 222b,..., 222n) from the separator (180, 220a, 220b,..., 220n), wherein the movable member (212a, 212b,..., 212n) is a belt disposed on rollers; a sensor (188, 214a, 214b,..., 214n) for providing information relating to weight of the cuttings (164, 174, 222a, 222b,..., 222n) received by the weighing unit (210a, 210b,..., 210n) while the movable member (212a, 212b,..., 212n) is moving; and a motor (230a, 230b,..., 230n) mounted at a side of the movable member (212a, 212b,..., 212n) adjacent the first longitudinal side and that moves the movable member (212a, 212b,..., 212n) to discharge the cuttings (164, 174, 222a, 222b,..., 222n) from the movable member (212a, 212b,..., 212n) at the second longitudinal side.