Dictionaries:
* Online Dictionaries: Merriam-Webster, Oxford English Dictionary, Dictionary.com, Cambridge Dictionary. These provide comprehensive definitions, etymology, and usage examples.
* Physical Dictionaries: A good quality physical dictionary will offer similar information.
Encyclopedias:
* Wikipedia: While not a formal dictionary, Wikipedia provides in-depth explanations of "crater" with various types of craters, their formation, and examples.
* Britannica: Britannica offers reliable information on various scientific topics, including geology, which provides detailed explanations of craters.
Specialized Resources:
* Geological Textbooks: For a detailed scientific understanding, geology textbooks will discuss crater formation and types.
* Astronomical Websites: Sites focused on astronomy (NASA, Space.com) will cover craters in the context of planetary science.
* Scientific Journals: Academic journals on geology, astronomy, and planetary science will provide advanced research and insights on craters.
The best source for you depends on your specific needs:
* General understanding: A dictionary is perfect.
* In-depth explanation: Wikipedia or Britannica are good options.
* Scientific research: Scientific journals and textbooks are necessary.
Don't hesitate to use multiple sources to get a comprehensive understanding of "crater."