What are context clues in English reading?

Which type of context clue is being used in this sentence? 'The arboretum, a place where trees are grown for study and display, is open to the public.'

If you see the word 'gleamed' in 'The silver ring gleamed in the sunlight,' which word is the best context clue for its meaning?

Which type of context clue is being used: 'Unlike her cheerful brother, Marie was morose.'

What could 'frigid' mean in the sentence: 'The frigid air made everyone shiver during the winter morning'?

Choose the type of context clue: 'She was elated – extremely happy – when she won the prize.'

In the sentence 'He wore tattered clothes, such as shirts with holes and pants that were torn,' what does 'tattered' most likely mean?

Which word in this sentence helps you understand the meaning of 'rapid'? 'The rapid stream flowed quickly past the rocks.'

When a writer provides examples after a word, which kind of context clue is being used?

Why are context clues important for middle school readers?