Which of the following would result in the loss of a large amount of oxygen in the atmosphere?
a. overharvesting of wildlife
b. pollution
c. deforestation
d. recycling

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

The coco river is a natural border between nicaragua and which other country

Which of the following can scientists estimate geologic time? a.observing rock sequences b.radiometric dating c.comparing fossils d.all of these