8d2f8662...
5a960688...
bd516240...
1c1c4602...
839a68f8...
6c6ba56b...
48d92b26...
IMAGE
Changes Around Us
Visual comparison of reversible and irreversible changes.
Click to zoom
Reversible vs. Irreversible Changes
Preview the major scientific themes of the year and recognize how physics, chemistry, biology, and earth sciences are interconnected.
Exploring material properties and changes.
Science isn't isolated into separate boxes. Fields like physics, chemistry, biology, and earth sciences are deeply interconnected. Discoveries in one area frequently inspire new questions in another.
Visual comparison of reversible and irreversible changes.
Reversible vs. Irreversible Changes
Matching exercise for types of changes.
Terms
Definitions
Connecting heat flow to the water cycle and life processes.
Heat flows and causes changes everywhere, from the melting of a single ice cube in a glass to the melting of a massive glacier. Driven by heat from the Sun, the Earth's water cycle operates continuously: water evaporates from the seas, falls back down as rain, and trickles deep underground.
Fill-in-the-blanks for the water cycle and life processes.
Science explores how things change and the natural cycles around us. For example, with heat from the Sun, water from the seas. This water eventually falls back down as , trickling down into the ground. We also see complex life processes essential for all animals to survive. To grow, animals must eat and . Furthermore, blood has to the nutrients from the food all over the body. These interconnected processes show how dynamic the natural world is.
Mid-page checkpoint on interconnectedness.
How light helps us measure time and understand the universe.
Long before electric clocks and digital watches existed, early humans observed the shadows of objects cast by the Sun to measure time. Today, light and shadows do more than help us mark hours or create shadow puppets; they give us a deep understanding of the universe we live in.