Clarification Statement - S.2.ESS.1.1.CS:
Examples of events and timescales could include volcanic explosions and earthquakes, which happen quickly and erosion of rocks, which occurs slowly.

Assessment Boundary - S.2.ESS.1.1.AB:
Assessment does not include quantitative measurements of timescales.

Science and Engineering Practices - PK2.SEP6.1:
Make observations (firsthand or from media) to construct an evidence-based account for natural phenomena.

Disciplinary Core Ideas - S.2.ESS.1.1.DCI:
ESS1.C: The History of Planet Earth •Some events happen very quickly; others occur very slowly, over a time period much longer than one can observe.

Crosscutting Concepts - CC6.1:
Things may change slowly or rapidly.

Clarification Statement - S.2.ESS.2.1.CS:
Examples of solutions could include different designs for using rocks, shrubs, grass, and trees to hold back wind, water, and land.

Science and Engineering Practices - PK2.SEP6.3:
Compare multiple solutions to a problem.

Disciplinary Core Ideas - S.2.ESS.2.1.DCI:
ESS2.A: Earth Materials and Systems •Wind and water can change the shape of the land. ETS1.C: Optimizing the Design Solution •Because there is always more than one possible solution to a problem, it is useful to compare and test designs. (secondary to 2-ESS2-1)

Crosscutting Concepts - CC6.1:
Things may change slowly or rapidly.

Assessment Boundary - S.2.ESS.2.2.AB:
Assessment does not include quantitative scaling in models.

Science and Engineering Practices - PK2.SEP2.4:
Develop a model to represent patterns in the natural world

Disciplinary Core Ideas - S.2.ESS.2.2.DCI:
ESS2.B: Plate Tectonics and Large-Scale System Interactions •Maps show where things are located. One can map the shapes and kinds of land and water in any area.

Crosscutting Concepts - CC1.2:
Patterns in the natural world can be observed, used to describe phenomena, and used as evidence.

Science and Engineering Practices - PK2.SEP8.3:
Obtain information using various texts, text features (e.g., headings, tables of contents, glossaries, electronic menus, icons), and other media that will be useful in answering a scientific question.

Disciplinary Core Ideas - S.2.ESS.2.3.DCI:
ESS2.C: The Roles of Water in Earth’s Surface Processes •Water is found in the ocean, rivers, lakes, and ponds. Water exists as solid ice and in liquid form.

Crosscutting Concepts - CC1.2:
Patterns in the natural world can be observed, used to describe phenomena, and used as evidence.