The document is a student workbook for standardized test preparation in earth science. It contains introductions and test-taking tips, as well as practice tests for each chapter in the textbook. The practice tests are designed to prepare students for national science tests with multiple-choice questions in similar formats.
The document summarizes the water cycle in 3 sentences or less:
The water cycle describes how water is circulated around Earth through different states as solid, liquid, and gas. As the sun warms water, it evaporates as vapor into the air, condenses into clouds, and falls back to Earth as precipitation on land and ocean where some is absorbed in the ground, stored in lakes and rivers, and flows out to sea, completing the cycle. Understanding the water cycle is important because human activities like pollution, farming, and development can impact available fresh water.
This document describes the key parts of a tree, including branches that grow from the trunk, twigs that grow from branches, leaves that process food, roots that extract water and food from soil, the trunk as the main support, bark as the protective outer layer, and that flowering trees produce fruit.