Volcanic ash
bombs
a. pebble-sized particles
b. particles ranging from the size of a baseball to the size of a car
c. fine rocky particles as small as a speck of dust
match a, b,and c to the missing blanks.

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous