What is a dark mysterious and non-nicotine mineral containing sample of a very common silicate? it's geology actually.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

How is the shape of the poem “peer” connected to its meaning?

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons