an aggregate is one type of land resource. what is an aggregate?

a layer of solid rock found beneath soil
the top layer of soil
a natural mixture of sand, gravel, and crushed stone
a naturally occurring mineral or rock

Calculate the enthalpy of the following reaction: 4 b (s) + 3 o2 (g) → 2 b2o3 (s) given the following pertinent information: (a) b2o3 (s) + 3 h2o (g) → 3 o2 (g) + b2h6 (g), δhoa = +2035 kj (b) 2 b (s) + 3 h2 (g) → b2h6 (g), δhob = +36 kj (c) h2 (g) + latex: \frac{1}{2} 1 2 o2 (g) → h2o (l), δhoc = −285 kj (d) h2o (l) → h2o (g), δhod = +44 kj

What is the overall order of reaction for rate = k[no]2[o2]

Which of these natural resources is non-renewable a.corn b.wind c.geothermal d.natural gas