Which set of words related to weather illustrates Tier 2 vocabulary suitable for instruction?

The correct choice features words that are defined as Tier 2 vocabulary, which refers to high-frequency words that are used across different contexts and are important for academic language. In this case, the terms "cycle," "system," and "observe" are abstract words that can apply to various subjects beyond just weather, making them versatile for deeper understanding and application in multiple academic contexts.

"Cycle" pertains to repeated processes, which can be found in science, mathematics, and even literature when discussing themes of repetition. "System" relates to organized structures found in science (like ecosystems) or functioning systems in general. "Observe" is a critical skill for scientific inquiry and learning across disciplines, reinforcing analytical and critical thinking skills.

The other choices contain more concrete and specific terms. For example, "cloud," "rain," and "sun" primarily describe physical weather phenomena, lacking the broader applicability of Tier 2 vocabulary. Similarly, "hot," "cold," and "temperature" refer to specific sensations or measurements, and "storm," "windy," and "fog" are descriptive of particular weather conditions. These words are commonly understood and do not encourage the same depth of application across various contexts as Tier 2 vocabulary does.