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.
Even the conditions at the time of the telling of a memory can change the form of the memory, influencing its content and belief in the truth of the memory in the future. Most scientists also agree that there are two identified forms of memory: explicit and implicit. Explicit memory, also called declarative or narrative memory, is the ability to consciously recall facts or events. This is the form of memory used, for example, when a person recounts the events of his or her day at work or school.