Grade 2 Science Week 19 | Teacher Guide

Grade 2 | SCIENCE

WEEK 19 • TEACHER GUIDE AND ANSWER KEY • DAYS 91–95

Read each lesson aloud with the child and model the worked example before practice. Do not show this key during practice. Accept oral, drawn or written answers where the child cannot yet write the whole answer. On Day 95, read aloud if needed but give no hints.

Week 19 Student Textbook | Week 19 Practice Workbook | Week 19 Teacher Guide | Week 18 Student Textbook | Grade 2 index

Day 91: Where Is Water Found on Earth?

Standard: Grade 2 Science Standard 9, 2.9

Practice record: Where water is found, printed on the Week 19 Practice Workbook.

Worked example: Is the water in a well fresh water or salt water? Worked answer: Fresh water.

In the ocean.
Any one of: a river, a stream, a lake, a pond, a spring or underground water.
Ocean water is too salty to drink. Drinking salty water makes a person even thirstier, so the salt must be taken out first. Accept any answer about the salt.

Teaching note: The table’s second column is filled in by the child (salt, fresh, fresh, salt).

Day 92: Water as a Solid and as a Liquid

Standard: Grade 2 Science Standard 9, 2.9

Practice record: Solid or liquid?, printed on the Week 19 Practice Workbook.

Worked example: Is rain solid or liquid water? Worked answer: Liquid.

Solid.
Antarctica.
Alabama is warm most of the year, so water does not stay frozen. Ice and snow melt quickly there.

Teaching note: The table’s second column is filled in by the child (solid, liquid, solid, liquid).

Day 93: Earth Changes: Slow and Fast

Standard: Grade 2 Science Standard 10, 2.10

Practice record: Slow or fast?, printed on the Week 19 Practice Workbook.

Worked example: A river slowly wears away its bank over 50 years. Is this a slow or a fast change? Worked answer: Slow.

Fast.
Rainwater slowly dissolves rock, such as limestone, and leaves empty spaces underground.
Slow part: over many years, water dissolves rock underground and makes empty spaces. Fast part: when a space gets too big, the ground above can collapse suddenly.

Teaching note: Sources are the Geological Survey of Alabama and the U.S. Geological Survey (below). No pictures of damage are used, and no injuries are described. The table’s second column is filled in by the child (slow, fast, slow, fast).

Day 94: Hands-On: Sort Earth Changes with Evidence

Standard: Grade 2 Science Standard 10, 2.10

Practice record: Event cards, printed on the Week 19 Practice Workbook.

Worked example: A card says sand dunes moved a few feet each year. Which words are the evidence, and is the change slow or fast? Worked answer: Evidence: a few feet each year. Slow.

Slow.
Card D.
Answers vary. Example: card F says suddenly caved in, so it was a fast change. Accept a card with its time words and a matching slow or fast label.

Teaching note: Correct sort: slow A, C, E; fast B, D, F. Cards E and F are the two parts of one sinkhole: point this out after sorting. Card sources are listed below. Use the observation checklist below.

Hands-on task observation checklist (Sort event cards: slow or fast). Check each item you observe. Four or five items shows the child met the task goal; two or three means repeat the task with support.

☐ Child read all six cards.
☐ Child underlined time words on each card.
☐ Child sorted at least five of the six cards correctly.
☐ Child wrote evidence words for at least three cards.
☐ Child explained the sorting using the evidence.

Day 95: Independent Check: Water on Earth and Earth Changes

Standard: Grade 2 Science Standard 9, 2.9; Grade 2 Science Standard 10, 2.10

Practice record: Facts about water and changes, printed on the Week 19 Practice Workbook.

Worked example: Is the water in a river solid or liquid? Worked answer: Liquid.

Solid.
Fast.
Example: the Tennessee River. Its water is fresh, but the water in the Gulf is salty. Accept any Alabama fresh-water place with the fresh versus salt difference.

Teaching note: Independent check: read aloud if needed, but give no hints.

Sources

NOAA National Ocean Service, How much water is in the ocean? | U.S. Geological Survey, How much of the Earth’s water is stored in glaciers? | Geological Survey of Alabama, Geological Hazards (sinkholes, earthquakes and landslides in Alabama) | Geological Survey of Alabama, Sinkholes in Alabama (sinkholes form where carbonate rock, such as limestone, can dissolve) | U.S. Geological Survey, What is a sinkhole? (rock dissolves and leaves spaces underground; the land can stay in place for a long time, then collapse suddenly) | U.S. Geological Survey, Landslide Hazards Program: What is a landslide? (some move quickly; some move slowly for centuries) | National Park Service, Grand Canyon: Geology (the Colorado River carved the canyon over millions of years) | U.S. Geological Survey, Mount St. Helens: From the 1980 Eruption to 2000 (summit lowered about 1,300 feet on May 18, 1980)