Not all rigid substances are crystalline solids; natural and ...

[michelleunicorn]

Not all rigid substances are crystalline solids; natural and manufactured glass lack the ordered arrangement of atoms and are said to be ___________________ _, meaning without form.
 Fill in the blank(s) with correct word

Question 2

Background extinction refers to ____.
 A)the continual extinction of species
 B)a small mass extinction
 C)the total number of extinctions in the history of Earth
 D)the extinction before a mass extinction
 E)the small extinctions that make up a mass extinction

[pallen55]

Answer to Question 1

amorphous

Answer to Question 2

A

[michelleunicorn]

Thanks for the timely response, appreciate it

[xiaomengxian]

Gracias!