Introduction. The asthenosphere is the layer of the Earth that lies below the lithosphere. It is a layer of solid rock that has so much pressure and heat the rocks can flow like a liquid.The rocks are less dense than the rocks in the lithosphere.ntroduction. The asthenosphere is the layer of the Earth that lies below the lithosphere. It is a layer of solid rock that has so much pressure and heat the rocks can flow like a liquid.
Dictionary entry overview: What does directive mean? â¢ DIRECTIVE (noun) The noun DIRECTIVE has 1 sense: 1. a pronouncement encouraging or banning some activity Familiarity information: DIRECTIVE used as a noun is very rare. â¢ DIRECTIVE (adjective) The adjective DIRECTIVE has 1 sense: 1. showing the way by conducting or leading; imposing direction on
The #define directive takes two forms: defining a constant and creating a macro. When defining a constant, you may optionally elect not to provide a value for that constant.In this case, the token will be replaced with blank text, but will be defined for the purposes of #ifdef and ifndef.f a value is provided, the given token will be replaced literally with the remainder of the text on the line. You should be careful when using #define in this way; see this article on the c preprocessor for a list of gotchas.