❣how do scientists use ice to study ancient climates? a. through glacial deposits and ice cores b. through glacial deposits and ice ages c. through ice cores and pollen grains d. through pollen grains and ice ages which greenhouse gas is produced by commercial refrigeration and air conditioning systems? a. carbon dioxide b. fluorinated gas c. nitrous oxide d. methane

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1. B

2. C

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c is the answer because when something is left after something evaporates that shows the chemical change.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.