MB is larger. There are 1024 KB in a MB. MB are bigger, just like GB are bigger than MB. Just think of Kilo being small, Mega being large, and Giga being huge, and then there is TB, but I won't get into that right now.
The word explicit means clear and fully expressed. If something is explicit, there is no question as to what it means, no hidden connotations and no room for misunderstanding. If a fact is explicit in a reading comprehension passage, it is stated outright. For example, if the first sentence of a story is It was a dark and stormy night, that is an explicit fact.
Explicit memory deals with semantic (memories for facts, information) memory and episodic memory (memory for time dated, spatially located, personally experienced events). The easiest way to understand this concept is memories that you can say out loud..mplicit is konwing how to do something without knowing how you actually do it, like riding a bike, explicit, is the opposite, i.e baking a cake. But these are part of a different theories to long term memory names like procedual, semantic.