--- title: 3.PS1.A.1 description: 3.PS1.A.1 Predict and investigate that water can change from a liquid to a solid (freeze),and back again (melt), or from a liquid to a gas (evaporation), and back again (condensation) as the result of temperature changes. image: https://www.knowatom.com/hubfs/Right%20Image.png --- [![Teacher Login](https://no-cache.hubspot.com/cta/default/347944/f56bee57-133e-4975-8055-799f1f23588b.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/f56bee57-133e-4975-8055-799f1f23588b) [Teacher Login](https://app.knowatom.com/signin) [![KnowAtom Logo](https://www.knowatom.com/hubfs/KnowAtom%20Logo.svg "KnowAtom Logo")](https://www.knowatom.com/) # 3.PS1.A.1 Predict and investigate that water can change from a liquid to a solid (freeze),and back again (melt), or from a liquid to a gas (evaporation), and back again (condensation) as the result of temperature changes. [![Download a Sample Unit](https://no-cache.hubspot.com/cta/default/347944/20eee377-e175-48fe-a039-ae723137a2a6.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/20eee377-e175-48fe-a039-ae723137a2a6) Science & Engineering Practices - [Developing and using models](https://www.knowatom.com/developing-and-using-models) - [Planning and carrying out investigations](https://www.knowatom.com/planning-and-carrying-out-investigations) - [Constructing explanations and designing solutions](https://www.knowatom.com/constructing-explanations-and-designing-solutions) - [Engaging in argument from evidence](https://www.knowatom.com/engaging-in-argument-from-evidence) - [Obtaining evaluating and communicating information](https://www.knowatom.com/obtaining-evaluating-and-communicating-information) Disciplinary Core Ideas - [Weather and Climate](https://www.knowatom.com/weather-and-climate) - [Conservation of Energy and Energy Transfer](https://www.knowatom.com/conservation-of-energy-and-energy-transfer) Crosscutting Concepts - [Patterns](https://www.knowatom.com/patterns) - [Cause and Effect](https://www.knowatom.com/cause-and-effect) [![New call-to-action](https://no-cache.hubspot.com/cta/default/347944/b5a1446e-d782-4a5f-a019-0b3b98c8304f.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/b5a1446e-d782-4a5f-a019-0b3b98c8304f) ## Browse 3.PS1.A.1 Lesson Plans Grade Ranges All K-2 3-5 6-8 [![](https://www.knowatom.com/hubfs/image1-Oct-07-2023-11-29-44-7026-AM.png) ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/structure-of-matter) ## [Structure of Matter In 3rd grade, students ask questions and conduct experiments to explore the world around them. In this unit, students unpack the phenomena of tiny particles called atoms that make up all matter in the universe. This page showcases key parts of the first lesson in this unit.](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/structure-of-matter) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/structure-of-matter) [![](https://www.knowatom.com/hubfs/image3-Oct-07-2023-11-32-55-9156-AM.png) ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-matter) ## [Heat and Matter In this unit, students use the scientific process to analyze Earth’s place in the solar system. They begin by modeling how matter is made up of tiny particles called atoms, and changes state when heat is added or removed. This page provides an overview of lesson 1B in which students explore the science phenomena of how heat affects matter. ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-matter) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-matter) [![](https://www.knowatom.com/hubfs/image3-Oct-07-2023-02-50-14-1580-PM.png) ](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/water-erosion) ## [Water Erosion In this unit, students stimulate the movement of tectonic plates and analyze maps to observe how plate boundaries create patterns in Earth’s features. In this lesson, they build on that knowledge to observe the science phenomenon of how water erodes sediment. This page highlights key components of this lesson.](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/water-erosion) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/water-erosion) [![](https://www.knowatom.com/hubfs/image1-Oct-07-2023-11-51-41-5726-AM.png) ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-evaporation) ## [Heat and Evaporation In the last unit, students learned about matter as they explored Earth’s position in the solar system. In this unit, students discuss how the sun provides light and heat to Earth, powering the water cycle, which in turn influences weather and climate. Students analyze the science phenomena of weather patterns in specific regions during a particular season. ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-evaporation) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/3rd-grade-science/heat-and-evaporation) [![](https://www.knowatom.com/hubfs/image1-Oct-07-2023-02-25-45-3539-PM.png) ](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/properties-of-matter) ## [Properties of Matter In this unit, students discuss the science phenomena of how matter has different properties depending on the number and kind of atoms that make it up. In this lesson, they observe how forces act on matter, focusing on how unbalanced forces cause objects to move. This page provides a high-level extract of this lesson. ](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/properties-of-matter) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/4th-grade-science/properties-of-matter) [![](https://www.knowatom.com/hubfs/image4-Oct-08-2023-11-09-12-9810-AM.png) ](https://www.knowatom.com/science-phenomena-videos/5th-grade-science/earths-water) ## [Earth's Water In this unit, students analyze the phenomena of Earth’s interacting systems, focusing on how the hydrosphere interacts with and is influenced by the other systems. In this lesson, students graph and model the distribution of fresh water and salt water on Earth and use a physical model to analyze how fresh water moves and becomes salty. This page showcases each section of this lesson.](https://www.knowatom.com/science-phenomena-videos/5th-grade-science/earths-water) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/5th-grade-science/earths-water) Standards citation: NGSS Lead States. 2013. *Next Generation Science Standards: For States, By State*s. Washington, DC: The National Academies Press. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it. ![KnowAtom Logo](https://www.knowatom.com/hubfs/KnowAtom%20Logo.svg "KnowAtom Logo") Quick Links Resources Sign Up for Our Blog ### Sign Up for Our Blog Connect with Us - - - - © 2026 KnowAtom LLC  •  10 Brady Drive Unit 3   •  Ipswich MA •   01938 USA [DO NOT SELL MY PERSONAL INFORMATION](https://www.knowatom.com/do-not-sell-my-personal-information) | [Privacy Policy](https://www.knowatom.com/privacy-policy) | [Terms of Use](https://www.knowatom.com/terms-of-use) ```json { "@context" : "http://schema.org", "@type" : "Organization", "address" : { "@type" : "PostalAddress", "addressCountry" : "USA", "addressLocality" : "Salem", "addressRegion" : "MA", "postalCode" : "01970", "streetAddress" : "27 Congress Suite 410" }, "alternateName" : "KA", "areaServed" : { "@type" : "GeoCircle", "geoMidpoint" : { "@type" : "GeoCoordinates", "latitude" : "+42.5182274", "longitude" : "-70.8877569" }, "geoRadius" : "150 km" }, "description" : "Next Generation Science STEM Curriculum", "email" : "fvigeant@knowatom.com", "image" : "https://www.knowatom.com/hubfs/KA-GSD.png", "logo" : "https://www.knowatom.com/hubfs/Knowatom-2017/Image/logo-1.png", "mainEntityOfPage" : { "@id" : "https://www.knowatom.com/3.ps1.a.1", "@type" : "WebPage", "description" : "3.PS1.A.1 Predict and investigate that water can change from a liquid to a solid (freeze),and back again (melt), or from a liquid to a gas (evaporation), and back again (condensation) as the result of temperature changes.\n\n" }, "name" : "KnowAtom", "sameAs" : [ "https://www.facebook.com/KnowAtom", "https://twitter.com/KnowAtom", "https://www.youtube.com/channel/UCS0rbN0RfqaU1xaISrdVpTA", "https://plus.google.com/110709105138117096940" ], "telephone" : "(617) 475-3475", "url" : "https://www.knowatom.com" } ```