Mengapakah lurah sungai di peringkat hulu
berbentuk 'V' ?

Sungai mulai tinggi di pergunungan sehingga mengalir dengan cepat menuruni pemandangan secara menegak. ... Sungai mengangkut batu ke hilir dan saluran menjadi lebih luas dan lebih dalam mewujudkan lembah berbentuk V di antara taji yang saling berkaitan.

Explanation:

saya menggunakan penterjemah untuk ini.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.