What keeps the layers of the atmosphere separated?
a. air pressure
b. air composition
c. changes in elevation
d. changes in temperature trends

Ahis which describe the horizons in a soil profile? check all that apply. horizon a is mineral deficient. bedrock lies below the soil layers. te horizon o forms from organic material, horizon b undergoes the least amount of change. horizon c is least affected by the soil formation process.

Which of the timelines above accurately represents the order of historical events in canadian history? a. one (1) b. two (2) c. three (3) d. four (4)

The purple arrow on the map above is pointing to the an important line of latitude. a. tropic of capricorn b. equator c. international date line d. prime meridian