Bone marrow. The inside of your bones are filled with a soft tissue called marrow. There are two types of bone marrow: red and yellow. Red bone marrow is where all new red blood cells, white blood cells, and platelets are made.
Mine is 8m x 7m (3m is 10 feet, so around 27 x 23 feet). This is normal for an Australian classroom, although there's a fair bit of variation.
Teaching hours are a minority of a teachers' workload, according to this survey. A primary school teacher will spend on average 19 hours a week of timetabled teaching. It's similar for secondary school classroom teachers, averaging 19.6 hours.Secondary school head teachers have much lower levels of classroom time, at 2.8 hours per week.he workload survey confirms that teachers are putting in a lot of hours outside of the school day, before 8am, after 6pm and at weekends. For primary classroom teachers, 23.8% of their hours are worked out of school each week, with secondary head teachers working 21.5% and secondary classroom teachers 21.4%.