Give an example of a change that the ecosystem was NOT able to recover from. Can you explain why?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as