Draw Lewis structures (the central atom is underlined) in order to rank the molecules in order of decreasing bond angle.

In 2002, the rare earth elements mine in mountain pass, california was closed because

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness