PBS
That Time Oxygen Almost Killed Everything
Oxygen keeps us alive, but did you ever consider how Earth found the right balance? Eons produced this video as part of a larger series that explores when Earth contained very little oxygen and green oceans ruled the planet. Viewers see...
Waterloo Mathematics
Number Sense and Numeration: Ratio and Rate
Seventh-graders solve 20 various types of problems related to ratio and rate. They write ratios in simplest form for each given statement, to compare the area of two figures, and write two ratios equivalent to each ratio. Pupils express...
Curated OER
There Is/Are - Counting Stars
In this counting stars activity, learners fill in the blanks to a passage, complete the questions, and write sentences with possessive forms. Students complete 3 activities.
Curated OER
Climate Change
In these science worksheets, 5th graders explore aspects of weather and recycling. In the first worksheet, students are given five questions about weather which they match to the statement about weather that corresponds to it. In the...
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