Does anyone what to talk... im bored... and kinda sad I don't mind talking about anything

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

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

Why does his teacher ask him to balance the equation by including the correct coefficient