1) What mineral cleaves in two directions and can be scratched by olivine (1) fluorite
(2) potassium feldspar
(3) quartz
(4) pyrite

2) Which group contains only minerals?

(1) pyroxene and limestone
(2) hematite and quartzite
(3) fluorite and coal
(4) halite and olivine

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a.the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

How are fossils used to date organisms?

Si units are the modern form of the