Bagaimana proses terjadinya pergeseran benua?

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Baca Juga :  Dalam suatu tes terdiri atas , soal pilihan ganda dengan , pilihan jawaban dan hanya satu kemungkinan yang benar. Berapa banyaknya kemungkinan susunan jawaban tes itu jika untuk setiap soal hanya boleh dipilih satu pilihan jawaban saja?

PERTANYAAN :


Bagaimana proses terjadinya pergeseran benua?space

Pembahasan

Di bumi terdapat tujuh lempeng utama dan banyak lempeng-lempeng yang lebih kecil. Lempeng-lempeng litosfer ini menumpang di atas astenosfer. Astenosfer ini berbentuk padat namun bisa mengalir seperti cairan dengan sangat lambat dan dalam skala waktu geologis yang sangat lama. Pada lapisan astenosfer terdapat arus konveksi yang disebabkan oleh aktivitas magma yang mampu mengerakan lempeng-lempeng yang ada di atas lapisan astenosfer. Mereka bergerak relatif satu dengan yang lainnya di batas-batas lempeng baik divergen (menjauh), konvergen (bertumbukan), ataupun transform (menyamping). Semuanya terjadi di daerah sepanjang batas lempeng. Pergerakan lateral lempeng lazimnya berkecepatan 50-100 mm/tahun. Pergerakan lempeng menyebabkan pembentukan dan pemisahan benua termasuk pembentukan superkontinen yang mencakup semua benua.space

Baca Juga :  A long time ago, there lived a couple in West Sumatra named RajoBabanding and Sadun Saribai. They had two children named Sabai Nan Aluih andMangkutak Alam. Sabai Nan Aluih was very beautiful. She had long hair, soft skin, and a smiling face. Sabai Nan Aluih was well-known for her beauty. People liked her very much., " Sabai Nan Aluihs beauty captivated not only young men but also Rajo Nan Panjang, an old and rich merchant. Rajo Nan Panjang was sure that Sabai Nan Aluih would not reject his proposal as he was wealthy and powerful. Furthermore, he was Rajo Babandings friend.", " One day Rajo Nan Panjang went to Rajo Babandings house to propose Sabai Nan Aluih. Rajo Babanding didnt agree that her daughter would marry the old and boastful man. Thats why he declined Rajo Nan Panjangs proposal. Of course, this made Rajo Nan Panjang angry. He asked Rajo Babanding to meet him at the field the following day.", " At night Sabai Nan Aluih had a bad dream. On her dream, she saw the granary was full of charcoals, goats were stolen, and chickens were seized by an eagle. She thought that her bad dream signed that her father would be in bad condition. She knew that Rajo Nan Panjang would take revenge on her fathers rejection and he would do many ways to win the fight. Thats why she begged her father not to meet Rajo Nan Panjang. She was afraid if Rajo Nan Panjang hurt him.", Rajo Babanding understood his daughter\s worry and tried to comforther. He said,"Don\t worry, dear. I will be just fine.", Then, he also said that he would make Rajo Nan Panjang realize his bad behavior and arrogance, The following day, Rajo Babanding met Rajo Nan Panjang. Rajo Nan Panjang told him that he could not receive any refusal. He challenged Rajo Babanding for fighting. Rajo Nan Panjang knew that Rajo Babanding was a very great fighter, so he asked her escorts to overran Rajo Babanding. After a fierce fighting, Rajo Babanding was defeated and died., " Sabai Nan Aluih heard that Rajo Nan Panjang had defeated her father. She was very sad and angry at Rajo Nan Panjang. She decided to meet Rajo Nan Panjang. She asked her brother to go withher, but he refused.Hewas afraid of Rajo Nan Panjang and his escorts. Sabai Nan Aluih had no other choice. She could not stay at home. She would defend her familys pride. So, she walked hurriedly to the field.", Arriving at the field, Sabai Nan Aluih met Rajo Nan Panjang. He persuaded her to marry him. However, Sabai Nan Aluih declined the proposal in a strict way. She told Rajo Nan Panjang that he should be responsible for what he had done to her father. Rajo Nan Panjang and Sabai Nan Aluihhad a great fight and finally SabaiNan Aluih defeated him., " People were amazed at Sabai Nan Aluihs bravery. Wickedness, boast, and greed would not remain."



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Baca Juga :  Seorang siswa SMAN 40 Jakarta memperoleh tugas dari guru Biologi, membuat eksperimen ”pengaruh cahaya terhadap pertumbuhan tanaman”. Dia melakukan percobaan berikut. Pot A dan pot B berisi tanah, pasir, dan pupuk dengan komposisi yang sama. Ke dalam masing-masing pot ini ditanam tanaman biji jagung. Selanjutnya, pot A diletakkan di tempat terlindung dan pot B diletakkan di tempat terbuka/terkena cahaya. Setelah beberapa hari Dia melakukan pengamatan terhadap kedua tanaman dalam pot A dan B. Dari eksperimen tersebut, tulislah rumusan masalah, hipotesis, variabel bebas dan variable terikat.,

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