5. Identify each of the following as an element, a mixture, or a compound. a. aluminum foil
b. air
C. water
d. salt water
e. copper
wire
f. steel

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

What human activity increases beach erosion?

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness