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This study aims to determine the ability of students’ metacognition in solving abstract problems in physical material. The study involved students who took through the test. Metacognition ability data obtained through written test consisting of questions metacognitive knowledge and metacognition skills. Data analysis is done descriptively. The result of the research shows that declarative knowledge dominates students metacognition knowledge, that is students can recognize the difficult problem and able to interpret in other forms but less able to recognize method used and how to finish, while students' metacognition skills are more dominant in planning and monitoring fields. Prediction and evaluation skills are still relatively low. Overall, metacognition ability of students included in the low category.

The purposes of this research were to estimate the crystallite size, density, and chemical composition of the ingot Ti: Al2O3 crystal grown by the Czochralski method. The crystallite size and composition of Ti: Al2O3 crystals had been determined using x-ray diffraction (XRD) and energy-dispersive x-ray spectroscopy (EDXS). Based on the Archimedes principle, the density of the crystals had been determined. The XRD patterns showed a single central peak with high intensity for all samples. It indicated that all samples had a single crystal. The average value of the samples' crystallite size was in the range of 20.798 nm to 34.294 nm. The ingot crystal density and Ti composition increased from the top to the bottom part because the solid solution was distributed unevenly during the growth process.

This study aimed at detecting the presence of groundwater in Masda Makmur Village, Rambah Samo District, Rokan Hulu Regency, using the Schlumberger configuration geoelectric method. The study consisted of 3 sounding points within every 100 m sounding track length. The measurement data is processed using IP2WIN software and Progress to see layer data below the ground level based on the value of the resistivity type. The results showed that the estimated groundwater could be found on track one with a kind of resistivity value of 7,44 Ωm at a depth of 15-22 m. Alleged groundwater can be found on the second track with a type of resistivity value of 75,73 Ωmat a depth of 13-18 m, and the estimated groundwater can be located on the third track with a kind of resistivity value of 82,52 Ωm, 93,26 Ωm. The deeper and the lower resistivity value shows that the layer has the potential as a carrier layer of groundwater (aquifer). Sounding 1 and 2 have the potential to make bore wells which are thought to be depressed aquifer. The results of this study can be used further for mapping the location of community boreholes

The purpose of a learning media is to become a learning device to facilitate the teaching and learning process in class. The learning process would be more efficient, and it would help students concentrate better. This research aims to develop an android-based learning media application so teachers and students can use it in the teaching and learning process. This research uses the RD (Research and Development) method. This research uses ADDIE (Analysis, Design, Development, Implementation, and Evaluating) development model which results in a product, which is a valid learning media that can be implemented according to validator assessment that was done in the product trial test in Universitas Negeri Yogyakarta. It can be concluded that this media belongs in the good category based on assessment from media and material specialists validator, 85,7% average percentage is obtained and belongs to the valid category, so android-based physics media integrated with landslide disaster education is feasible to be used in physics learning. This media is made with an interesting and interactive interface so students can have a better understanding of physics learning integrated with landslide disaster education as well as disaster preparedness.

This research aimed to understand the critical thinking ability improvement and preparedness assisted by Android-based media to understand landslides through physics learning and understand the effectiveness of the media. This research provides knowledge about disaster preparedness through physics learning in landslide-prone schools using Android media. This research used quasi-experimental with Control Group Design. The research subjects included tenth-grade students in class X (30 people) at SMA N 1 Kokap. The samples were selected using the lottery method and saturated sampling technique to determine the control and experiment groups (quasi-experimental with Control Group Design). The pretest and posttest were in the form of essay questions. The analysis data used independent sample T-test and effect size. The results show that the average critical thinking ability of the experimental class increased from 18.13 to 65.00, and the average preparedness increased from 68.75 to 81.88. The results of the independent sample t-test show the value of Sig. (2-tailed) on critical thinking ability was 0.000 and preparedness was 0.027 (Sig. (2-tailed) 0.05). Thus, it can be concluded that there are significant differences in critical thinking ability and disaster preparedness in the experimental class and the control class. The effect size of using an Android-based understanding of landslide natural disasters on students' critical thinking ability and preparedness is 2.0 with high effectiveness. Media landslides and landslides through Android-based physics learning can improve students’ critical thinking ability and disaster preparedness.