Yes. The "Hipertexto Digital" includes videos, animations, and self-grading quizzes. It is usually sold as a license code inside new physical books or via Santillana’s digital store.

: Properties of waves, including reflection, refraction, and diffraction. Electricity

I see you're looking for the PDF version of . This is a very popular textbook for 8th-grade Natural Sciences in Spanish-speaking countries (often aligned with Colombia, Ecuador, and other Latin American curricula).

Puedo escribir una historia basada en esa búsqueda. Asumo que quieres una narración corta inspirada en el título "Hipertexto Santillana 8 Ciencias Naturales PDF". Aquí tienes: