Rocks in the Earth's mantle contain a higher percentage of and than do rocks in the Earth's crust. A- silicon and oxygen
B- iron and silicon
C- iron and magnesium
D- magnesium and oxygen

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.

Which describes an object in projectile motion? check all that apply.a.gravity acts to pull the object downb.the object moves in a straight path.c.the forward velocity of the object is 0 m/s.d.the object’s inertia carries it forward.e.the path of the object is curved.