Probably the most useful
science that encompasses every other
science, math, and engineering. Without it the
water you drink would kill you or not be there (groundwater aquifers), the buildings we use would subside/crack/soil compress/liquefy/corrode/fail, just about anything wouldn'
t exist (what do you think steal, iron, copper, titanium, etc. are mined from?), there wouldn't be oil, natural gas, or coal (the world would stop), we would still think the Earth was 6000 years old, the environment would die, and a bunch of other things you wouldn't even think of would cease.