Which variables are unknown? pressure volume temperature moles

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .