In order to measure the mass of water, it needs to be in a container.

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

An observation that requires measurement is called quantitative observable or qualitative

Nonpoint source pollution is difficult to control because it