Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy... Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy... Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy... Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy... Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy... Oil and gas are valuable non-renewable resources. With the increasing dependence of mankind on oil and gas resources, it is highlighted that this resource is becoming increasingly heavy...