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26 tháng 4 2021

 Khu vực đồi núi
– Khu vực đồi núi chia thành 4 vùng:
a) Vùng núi Đông Bắc
– Là một vùng đồi núi thấp nằm ở tả ngạn sông Hồng.
– Có những cánh cung lớn và trung du phát triển rộng.
– Địa hình Caxtơ khá phổ biến.
b) Vùng núi Tây Bắc
– Là những dải núi cao, những sơn nguyên đá vôi hiểm trở nằm song song, kéo dài theo hướng Tây Bắc-Đông Nam.
– Khu vực còn có những đồng bằng nhỏ trù phú nằm ở giữa vùng núi cao như: Mường Thanh, Nghĩa Lộ.
c) Vùng Trường Sơn Bắc
– Dài khoảng 600km.
– Là vùng núi thấp, 2 sườn không đối xứng.
– Sườn Đông hẹp và dốc, có nhiều núi nằm ngang chia cắt đồng bằng
d) Vùng Trường Sơn Nam
– Là vùng đồi núi và cao nguyên hùng vĩ.
– Đất đỏ badan dày, xếp thành từng tầng trên các độ cao 400m, 800m, 1000m
e) Ngoài ra còn có địa hình bán bình nguyên Đông Nam Bộ và vùng đồi trung du Bắc Bộ.

26 tháng 4 2021

- Địa hình đồi núi chiếm 3/4 diện tích lãnh thổ nước ta.

- Hệ thống núi: Hệ thống núi chạy dọc bên bờ Biển Đông, kéo dài trên 1 400 km từ biên giới Việt - Trung đến Đông Nam Bộ. Các dãy núi lan ra sát biển thu hẹp diện tích đồng bằng.

- Hướng dãy núi: Các dãy núi nước ta có hai hướng chính : hướng tây bắc - đông nam và hướng vòng cung.

- Phân bậc rõ rệt: Hệ thống núi ở nước ta có sự phân bậc rõ ràng, trong đó đồi núi thấp chiếm ưu thế với 60% diện tích cả nước, núi cao trên 2 000 m chỉ chiếm khoảng 1%. Những vùng núi cao địa hình rất hiểm trở, lắm đèo dốc như vùng Tây Bắc, Tây Nguyên,...

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20 tháng 5 2021

Vì trước mùa mưa thì các nơi sẽ không có mưa nên lưu lượng sông phải dâng lên từ từ mới dẫn đến lũ

-> Miền Bắc chia làm 4 mùa, mùa đông mưa ít nên cần 1 tháng để nước dâng tạo thành lũ

-> Miền Nam chia thành 2 mùa nên mùa khô kéo dài, không có mưa gây thiếu nước nên phải có thời gian dài hơn là 2 tháng để nước dâng lên thành lũ

9 tháng 4 2021

khó quá

10 tháng 4 2021

- Bạn nên vẽ biểu đồ hình tròn nhé!

Tuỳ bạn. Mình đi đội tuyển Địa lí của trường có tất cả 9 loại biểu đồ:

Thẳng, cột, thanh

Chồng, đường, tròn

Miền, kết, mạng

Bạn tìm hiểu từng loại và thấy cái nào hợp lí nhất thì vẽ. Mỗi loại có một chức năng riêng

30 tháng 3 2021

- Thuận lợi:

  • Biển nước ta rất giàu hải sản, có nhiều vũng, vịnh, tạo điều kiện cho nước ta phát triển ngành đánh bắt và nuôi trồng hải sản, phát triển giao thông vận tải trên biển.
  • Cảnh quan ven bờ tạo điều kiện phát triển du lịch.
  • Các khoáng sản như dầu khí, titan, cát trắng cung cấp nguyên liệu và vật liệu.
  • Biển còn tạo điều kiện cho phát triển nghề muối.

- Khó khăn:

  • Biển nước ta rất lắm bão, gây khó khăn, nguy hiểm cho giao thông, cho hoạt động sản xuất và đời sống nhân dân ở vùng ven biển.
  • Thuỷ triều phức tạp (chỗ nhật triều, chỗ bán nhật triều) gây khó khăn cho giao thông.
  • Đôi khi biển còn gây sóng lớn hoặc nước dâng ảnh hưởng tới đời sống nhân dân ven biển.
  • Tình trạng sụt lở bờ biển và tình trạng cát bay, cát lấn ở Duyên hải miền Trung.
30 tháng 3 2021

cop mạng ạ :))

Bài làm:

- Thuận lợi:

  • Biển nước ta rất giàu hải sản, có nhiều vũng, vịnh, tạo điều kiện cho nước ta phát triển ngành đánh bắt và nuôi trồng hải sản, phát triển giao thông vận tải trên biển.
  • Cảnh quan ven bờ tạo điều kiện phát triển du lịch.
  • Các khoáng sản như dầu khí, titan, cát trắng cung cấp nguyên liệu và vật liệu.
  • Biển còn tạo điều kiện cho phát triển nghề muối.

- Khó khăn:

  • Biển nước ta rất lắm bão, gây khó khăn, nguy hiểm cho giao thông, cho hoạt động sản xuất và đời sống nhân dân ở vùng ven biển.
  • Thuỷ triều phức tạp (chỗ nhật triều, chỗ bán nhật triều) gây khó khăn cho giao thông.
  • Đôi khi biển còn gây sóng lớn hoặc nước dâng ảnh hưởng tới đời sống nhân dân ven biển.
  • Tình trạng sụt lở bờ biển và tình trạng cát bay, cát lấn ở Duyên hải miền Trun
27 tháng 3 2021

Trả lời:

 Đặc điểm sông ngòi VN là có mạng lưới sông dày đặc, sông nhiều nước, giàu phù sa, chế độ nước theo mùa và thất thường

- Mạng lưới sông ngòi dày đặc: chỉ tính những con sông dài trên 10km thi cả nước có 2360 con sông (sông Hồng, sông Đà, sông Lô, sông Đồng Nai…). Đi dọc bờ biển cứ 20km lại gặp một cửa sông. Mật độ sông là 0,6 km/km2.

Sông ngòi nước ta phần lớn là sông nhỏ do lãnh thổ hẹp ngang (các sông ở duyên hải miền Trung: sông Hiếu, sông Con, sông Trà Khúc…)

- Sông ngòi nhiều nước, giàu phù sa:

+ Sông ngòi nước ta có lượng nước lớn, tổng lượng nước của tất cả sông ngòi chảy trên lãnh thổ là 839 tỉ m3/năm. Trong đó có 60% lượng nước được cung cấp từ phần lưu vực ngoài lãnh thổ: hệ thống sông Cửu Long, hệ thống sông Hồng...

+ Sông ngòi giàu phù sa: tổng lượng phù sa hàng năm của hệ thống sông ngòi trên phần lãnh thổ nước ta là khoảng 200 triệu tấn/năm (hệ thống sông Hồng chiếm khoảng 60%, sông Mê Kông khoảng 35%)

- Thủy chế theo mùa:

+ Chế độ dòng chảy của sông ngòi nước ta phù hợp với sự phân mùa của lượng mưa. Mùa lũ trùng với mùa mưa, mùa cạn trùng với mùa khô. Mực nước trên sông giữa hai mùa chênh lệch rất lớn, mùa lũ mực nước chiếm tới trên 70 - 80% tổng lượng nước, mùa cạn ít nước chỉ chiếm 20 – 30% (đặc biệt là sông ngòi ở miền Nam Trung Bộ và Nam Bộ)

+ Chế độ mưa diễn biến thất thường nên chế độ dòng chảy sông ngòi cũng thất thường: có năm mùa lũ sớm, có năm lũ muộn gây ra hiện tượng lũ lụt, hạn hán gây ảnh hưởng tới các hoạt động sản xuất và đời sống của nhân dân. Vì vậy cần phải đầu tư, phát triển thủy lợi để chủ động tới tiêu.