Which is the least accurate description of molecules?

a. they are pure substances.
b. they are linked together by transferred electrons.
c. they are what make up some elements and compounds.
d. they are made up of 2 or more atoms of 1 or more elements.

Several processes form metal ore. match each process to its description. volcanic activity weathering hydrothermal energy rocks break down as they interact with air and water. arrowright density differences and other factors cause metals to concentrate in igneous rocks. arrowright seawater heats up from contact with hot rock, and metals dissolve in it. the water rises and contacts cooler water, causing metal ores to settle on the ocean floor. arrowright

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults