An igneous rock that originally had 8000 atoms of a certain radioactive material when it was formed is found to now have only 250 atoms of that material left. If the half-life of the radioactive material is 2 million years, how old is the igneous rock

If the distance between two points on the ground is 10 miles and the distance between the same two points on a map is 4 inches, what is the map scale expressed as a ratio?

Asap! ! ! ! true or false the gobi desert, the largest desert in asia. covers parts of northern china and southern russia

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.