The largest icebergs recorded have been calved, or broken off, from the Ross Ice Shelf of Antarctica. Iceberg B-15, photographed by satellite in 2000, measured 295 by 37 kilometres (183 by 23 mi), with a surface area of 11,000 square kilometres (4,200 sq mi).
Problem-based learning, or PBL, is an instructional practice that requires students to work together to solve problems. This method is designed to engage all learners, even those who typically struggle. PBL is a model that relies on students to think deeply and be cooperative learners.
In RtI, the problem solving method is used to match instructional resources to educational need. The problem solving method is used at all three tiers: for all students (Tier 1), for groups of students (Tier 2), and for individual or small groups of students (Tier 3).tI involves an education process that matches instructional and intervention strategies and supports to student needs in an informed, ongoing approach for planning, implementing, and evaluating the effectiveness of instruction, curricular supports, and interventions.