misfire. verb fail, go wrong, fall through, miscarry, go pear-shaped (informal), fail to go off, go phut (informal) Some of their policies had misfired.
The exosphere is the layer of the atmosphere. a. closest to the earth's surface. b. that absorbs ultraviolet radiation from the sun. c. where gas molecules can be exchanged between earth's atmosphere and outer space. d. where air temperature stops increasing with altitude and starts decreasing.
The highest layer of earths atmosphere is the exosphere. The inner core has the most or highest amount of density (iron/nickel). I think its the core of the Earth with highest temperature with  6000 degree Celsius. The crust is the layer of the Earth that has the the lowest density. It depends a bit on what you consider being a part.