The atlantic ocean is expanding. what does this tell us about plates under the atlantic ocean?
a. they are being forced down
b. they are being force apart
c. they are being pressed together
d, most likely nothing is happening to the plates

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?