What was significant about the clay samples from the western hemisphere? how was the alvarez hypothesis modified in response?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction

Ne way in which elements differ from each other is the structure of the electron cloud in each element's atoms. in an electron cloud, an electron that is farther away from the nucleus has