8 The forces of volcanic eruptions vary. Some eruptions explode violently,
and others are slow and quiet. Which type of eruption is happening when
Pyroclastic materials are released?
F. a quiet eruption
G. a violent eruption
H. a moderate eruption
I. quiet eruplions alternating with moderate cruptions

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

By what primary heat transfer mechanism does the sun warm the earth?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?