A layer of hot rock. The upper most part of the mantle and the crust together form a rigid layer. Like a road tar softened by the heat of the sun, this part of the mantel is somewhat soft - it can bend like plastic. Is a layer of molten metal that surrounds the inner core. Is a dense ball of solid metal.
In many countries, including Canada, having smoke and carbon monoxide detectors in the house is the law. The reason is simple: these alarms save lives. Many house fires occur at night. If there is no smoke detector, those sleeping in the house may not notice the fire and will be overwhelmed by smoke.
You can test a carbon monoxide detector to ensure it can identify the level of carbon monoxide (CO) in the air, measured in parts per million (ppm). Pressing the 'Test' button on the detector will only tell you whether the device has adequate electrical power from an outlet or batteries.tep 3: Test Digital Readout CO Detectors with a Low Level CO Source. To confirm that a digital readout CO detector is detecting carbon monoxide, test it with a substance that will detect low levels of the gas, such as a lit cigarette or a lit incense wand.