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.
Carbon monoxide can seep into your home through vents and doors. 6) DO I NEED A CARBON MONOXIDE (CO) ALARM? WHERE SHOULD IT BE INSTALLED? Every home with at least one fuel-burning appliance/heater, attached garage or fireplace should have a carbon monoxide alarm. If the home has only one carbon monoxide alarm, it should be installed in the main bedroom or in the hallway outside of the sleeping area. An alarm should be installed on every level of the home and in sleeping areas. Place the alarm at least 15 feet away from fuel-burning appliances.