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STRUCTURE ET RELIEF
Matériel didactique : Carte de la RDC
Objectif opérationnel : A l’issue de la leçon l’apprenant sera capable de : connaître la structure de la RDC et ses reliefs.

Rappel 

Quelle est la superficie de la RDC ?

Rappel 

La RDC à la superficie de 2.845.410 km².

Motivation 

Les épanchements volcaniques rendent le sol comment ?

Motivation 

Localisées à l’est du pays. Ils sont formés de larves volcaniques. Ces larves rendent le sol fertile, favorable à l’agriculture.

Annonce du sujet 

Aujourd’hui nous allons étudier la structure et reliefs la RDC.

Annonce du sujet 

Aujourd’hui nous allons étudier la structure et reliefs de la RDC.

Analyse 

La RDC est formée de combien d’ensemble de structures ?

 

 

 

 

 

 

 

 

Quels sont les couches sédimentaires qui sont superposés sur le socle ancien ?

 

 

 

Les épanchements volcaniques rendent le sol comment ?

 

 

Carte de la RDC

 

 

 

 

Où se localise la plaine littorale ?

 

 

 

 

 

 

 

 

 

Citez les points les plus bas de la cuvette.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Citez les massifs anciens qu’on trouve la chaine de Mitumba

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Le massif de Ruwenzori constitue la frontière entre quels pays ?

 

 

Citez les formes des volcans de monts Virunga ?

Analyse 

La structure géologique de la RDC est formée des 4 ensembles :

  • Le socle ancien          C'est un terrain érodé, aplani et endurci au fil de temps par les intempéries (les précipitations et la chaleur).

Le socle ancien est formé des roches métamorphiques (gravités, quartz, …)

 

  • Le terrain de couverture

Il est constitué de dépôts qui se sont superposés sur le socle ancien formant ainsi la couche sédimentaire : le sable, argile, calcaire.

  • Les épanchements volcaniques

Localisées à l’est du pays. Ils sont formés de larves volcaniques.

Ces larves rendent le sol fertile, favorable à l’agriculture.

  • Les formations littorales ou côtières

Elles sont constituées de dépôts, …….... (sable, argile, …….., calcaire) apportés par le fleuve Congo pendant la crue.

  1. La plaine littorale

C’est une plaine de 37 kms de long, de ± 150 kms de large dont l’altitude varie entre 0 et 200 m et est situé à l’extrême Ouest de la province du Kongo Central (ex Bas-Congo) et longe la côte atlantique.

  1. La cuvette centrale

Située au centre du pays, la cuvette centrale est une très vaste dépression (un fossé, un trou) de 8…… km² de superficie dont l’altitude varie entre 340m et 700 d’altitude.

Les points les plus bas de la cuvette sont : les lacs Ntumba et Maï-Ndombe, par contre les plus hauts points sont les collines des Uélé, P.O de ZONGO et Mobayi Mbongo (Equateur) au nord du pays et du haut Lukenyi au Kasaï.

  1. Le plateau
  1. Le bas-plateau

Avec une altitude moyenne de 500m le bas plateau forme autour de la cuvette centrale une véritable ceinture composé de :

  • Au nord : le plateau des Uélés et de l’Ubangi
  • Au sud : le plateau du Kwango et du Kasaï
  • A l’ouest : le plateau de bateke
  1. Les Hauts-Plateaux

Ils forment la 2e ceinture après la cuvette centrale et leur altitude varie entre 1000 et 2000 m.

On les rencontre :

  • Au Sud-Est, au Katanga, où l’on trouve la chaine Mitumba (massif ancien formé) :
  • Au plateau de Lamanika (17.500 m) d’altitude
  • Au plateau de Kundelungu (1700 m d’altitude)
  • Au plateau de Marungu 2000 m d’altitude
  • Le mont Hakansson 1.100 m d’altitude
  • Le mont Kibara 1890 m d’altitude
  • Le mont Bea 1100 m d’altitude

Le mont bleu forme la ligne de partage entre les eaux du bassin du fleuve Congo et celle du Nil.

A l’Ouest, où l’on a le mont Cristal ; c’est une vieille montagne attaquée par l’érosion et qui lui a donné les caractéristiques d’un haut plateau.

  1. Les montagnes
  1. Massif de Ruwenzori

Situé entre le lac Albert et Edouard, le massif de Ruwenzori est caractérisé par la présence des neiges éternelles ou glaciers éternels à son sommet.

Le massif de Ruwenzori autrefois appelé Mont de la lune héberge le plus haut sommet du pays dont le PIC Albert (5100m d’altitude et le pic Marguerite le plus haut sommet de la RDC avec 5120 m d’altitude.

Ce massif constitue la frontière naturelle entre la RDC et l’Ouganda.

  1. Monts Virunga

C’est une chaîne des montagnes volcaniques (4517 m) localisée au Nord du lac Kivu. Elle est formée d’un ensemble des volcans actifs et endormis.

  1. Volcans actifs
  • Nyamulagirta 3068 m d’altitude
  • Nyiragongo (3470 m d’altoitude)
  • Karisimbi (4507 m) d’altitude
  1. Volcans endormis ou éteints
  • Sabinio (3647 m)
  • Visoké (3771m)
  • Mikeno (4437m)

La RDC est formée de combien d’ensemble de structure ?

 

La RDC est formée de 4 ensembles.

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