The phrase "a vast source of" is grammatically correct and can be used in written English.
It is often used to describe something that is a large or abundant source of something. Example: The internet is a vast source of information on any topic imaginable.
British to its core, it is a vast source of all those half-forgotten rhymes for counting, patting, jiggling and soothing babies and toddlers.
He was prospecting for a vast source of clean, renewable energy that seemed straight out of a Jules Verne novel: the heat simmering within the earth's bedrock.
This number represents a vast source of untapped income – and in an era of declining retail sales for games, identifying new streams of digital revenue is becoming vitally important.
It doesn't help, Mr. Gurría said, that the United States, the world's second-largest energy consumer after China, has found a vast source of oil and natural gas in shale rock.
This exercise doesn't really need to have anything to do with social media, however, I do think that the internet is a vast source of information on careers, top professionals in each industry and the top jobs/employers in your field.
Critics on many sides said the program had become a vast source of temporary foreign workers at a time of high joblessness for Americans and had lost some of its purpose as a source of positive cultural exposure to the United States for foreign university students.
Enormous amounts of wastes generated from agricultural activities are a vast sources of plant nutrients, including macro- and micro-nutrients in organic forms.
Investors have been disappointed by the Monterey Shale, a potentially vast source of oil in the Golden State that has so far proved elusive and fallen below expectations.
It's a question that's amplified to a worldwide scale when he's confronted by cameras, sees himself on television, and is recognized and hailed as a public hero while enduring spasms of self-questioning and self-doubt that are sparked by an external — and equally vast — source of doubt: the federal government.
Microorganisms based biosynthesis of nanomaterials has triggered significant attention, due to their great potential as vast source of the production of biocompatible nanoparticles (NPs).
Based in Colorado, Gibson suspects his company might be at a disadvantage because it is not located near vast sources of venture capital.
