Learn science using videos, articles, and TEKS-aligned practice exercises. Review the fundamentals of matter and energy, forces and motion, Earth's systems and processes, living …

NGSS science and engineering practices (SEPs) Science and Engineering Practices: Themes SEP.1 Asking questions and defining problems

Test your knowledge on the scientific method and experimental design!

The scientific method is a logical approach to understanding the world. It starts with an observation, followed by a question. A testable explanation or hypothesis is then created. An …

Practice Course Grade 8 Science 5,800 possible mastery points Mastered Proficient

Explore how scientists use observation, making guesses (hypothesis), and experiments to understand the world in this engaging and educational middle school science video.

Practice Course Grade 7 Science Course challenge Test your knowledge of the skills in this course.

Learn AP Environmental Science using videos, and AP-aligned practice. Review the fundamentals of ecosystems, biodiversity, populations, earth systems and resources, land and …

Practice Exponents with integer bases Get 5 of 7 questions to level up! Practice Not started Exponents with negative fractional bases Get 3 of 4 questions to level up! Practice

Scientific notation ("standard form" for British English speakers) lets us condense a number. Writing the power that a number is raised to saves us a lot of space by omitting zeroes more …