What substances does lichen and moss produce that will break down rock? 1.) soil
2.) acid
3.) rust
4.) ice

Scientist have long study the earths climate by looking at which of the following? the earths orbit. the earths rock layers. the antarctic ice. the earths oceans.

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?