Biogas has several advantages comparing on the use of fossils fuels such as gasoline and natural gas. Biogas can be produced continuously because it grows from the organic raw materials to create a clean and healthy environment and free pollution. Utilization of animal waste as an energy source of biogas will not reduce the amount of organic fertilizer produced, but will produce methane (CH4) as an energy source. The research was done by mixing cow dung, rumen and water with various comparing materials and time to produce the highest biodiesel. The result of research by mixing cow dung (rumen) and water produced the highest biogas in a 1: 2 mixture. From the 3rd day, it has produced biogas but cannot be used because the CO and CO2 contents are very high. The result on the 10th day, it can be already used. The highest biogas production was resulted on 15th – 16th day in which producing 5 liters biogas from 110 kg cow waste with 220 kg water contents. The results are getting smaller but it still produces until the 30th day. The highest result to produce renewable energy was by utilizing without reducing the function of organic fertilizer.
With a strong motivation that will lead to high learning activities for students as well. With this picture it is also clear that motivation has a great influence on student achievement. The level of achievement can also be determined by the size of a person's motivation to learn. Achievement is a condition that is better than someone else. For example, a student can see his performance through comparisons with other classmates. Usually, with this comparison, students are more motivated to achieve good performance.
Interconnected Integration based learning is really needed to narrow the dualism space or the science dichotomy which separates between general education and religion education which then has an impact on the separation and segregation of religious awareness and general science. In the learning process, critical and creative thinking skills are very important, because it can make people become more mentally flexible, open and easy to adapt to various situations and problems. The type of this research was research and development. The development model used in this study was a modification of Borg and Gall's development stage which states that there were 10 stages in research and development. The research results showed that the instructional materials produced had very good validity (89%), very practical (91.19% by teachers and 86.21% by students and very efficient with the average critical and creative thinking (pretest) of students; 66.31 and posttest 80.26, and the results of the t-test count = 15.712 with sig 0.00 <0.05. This shows that there were significant differences before being treated and after treated by using the interconnection approach in improving students' critical and creative thinking.
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