So you're already putting up a week anyway. One more week isn't a big deal...you could even do that from home during the first week the school is closed.
Is "Life Science" the modern term for biology? We just called it biology, chemistry and physics when I was in school. The web approach is fine except for lab work.
6th graders take Earth Science (Geology, meteorology, astronomy)
7th grade - Life Science
8th grade Physical Science (Chemistry, Physics)