Which of the following was used to figure out the age of the Earth a) zircon crystals
b) fossil record of dinosaurs
c)oceanic rocks
d) written observations by humans

will give to the first correct answer! need this asap!​

Which of these has the least impact on the climate of a place

What effect has the drug trade had on some governments in middle and south america? a. it has funded political instability. b. many nations have created democratic governments. c. many governments have allowed the drug trade to fund local programs. d. it has funded political stability.

What are cutting "steps" or terraces