What is the ratio between hydrogen gas and oxygen gas in the decomposition of water (note: you must write out the equation) H2 : O2? 2:1

4:1

1:1

2:3

This is what a calorimeter is used for simpler ex, to measure calories in food.

Shania is trying to determine the oldest geologic unit on this map and the reason to why is she unable to do so is that  the units are all the same age.. when there is the same age, there will be no oldest geologic unit and that i cannot be credible.

Not sure but i think it's b.