1. Weathering

2. Everything else on the counter.
What you need today:
Pencil
Bellringer sheet
Everything else on the counter.

3. Bellringer # 4 The Great Sphinx
Of all the amazing statues built in ancient times, the Great Sphinx of Giza is one of the few that still stands. For many years it was partially buried in sand, which helped protect it. Even after many restoration projects, the statue still lacks some of its original features. It surely had a nose when it was first built and perhaps a beard as well.
1. How did being buried in sand help protect the Great Sphinx?
2. How might the statue have lost its nose and beard?

4. Today’s Objectives Students will be able to:
Explain how weathering breaks down rock.
Explain how a rock’s surface area affects the rate of weathering.

5. Today’s Science Practice
Science and Engineering Practices
Asking questions and defining problems.
Developing and using models.
Planning and carrying out investigations.
Analyzing and interpreting data.
Using mathematics and computational thinking.
Constructing explanations.
Engaging in argument from evidence.
Obtaining, evaluating, and communicating information.

6. Weathering
The mechanical and chemical processes that change objects on Earth’s surface over time are called weathering.
Over thousands of years, weathering can break rock into smaller and smaller pieces, such as sand, silt, and clay.

7. Mechanical Weathering
When physical processes naturally break rocks into smaller pieces, mechanical weathering occurs.
The chemical makeup of a rock stays the same during mechanical weathering.
Mechanical weathering can be caused by ice wedging, abrasion, plants, and animals.

8. Surface Area
When something is broken into smaller pieces, it has a greater surface area.
Surface area is the amount of space on the outside of an object.

9. Today’s Science Practice