How do we account for the great variety of substances in the world?
A) The Earth is 4.5 billion years old.
B) Most of these substances are organic compounds.
C) Atoms are incredibly small.
D) There are many possible combinations of atoms.
Question 2
Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close.
B) The nucleus of one atom repels the nucleus of another atom when it gets close.
C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.
D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.
From space earth shows itself as a planet covered mostly by water.
Smallest Dog in the world
Earth’s Spheres
World of Children
Dry Shrublands and Woodlands on the world map