What is a photon?
What will be an ideal response?
A single "particle" or pulse, of electromagnetic radiation is referred to as a photon.
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Why do the minerals calcite and dolomite bubble with the mineral or its powder are placed in hydrochloric acid?
A) The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion. B) The acid and the mineral together react with oxygen in the air, releasing CO2 gas. C) Both minerals are metal hydrides, and when placed in hydrochloric acid they give off hydrogen gas. D) Both minerals are sulfides, and the acid reacts to release sulfur dioxide gas.
Ten thousand years ago, forests covered approximately 50% of Earth. Today, forests cover approximately ________ of the Earth's land area
A) 15% B) 5% C) 30% D) 50% E) 70%
An outwash plain is a large area in which accelerated erosion has removed most of the soil
Indicate whether the statement is true or false.
What is relative dating, and what can it tell us? What will be an ideal response?