LANDFORMS- LAVA PLATEAU

LAVA PLATEAU- WHEN THE FLUID BASIC LAVA ESCAPE FROM SEVERAL LONG, NARROW OPENING IN THE EARTH’S CRUST , THE SERIES OF OUTPOURING OVER A LARGE AREA MAY BE FORMED KNOWN LAVA PLATEAU

VOLCANIC LANDFORMS

VOLCANIC PLUG– when the igneous rocks/magma in the vent solidifies in the extinct volcano and the sedimentary rock( mass resistant rocks) are weathered and exposed the igneous rock/volcanic plug  will appear on the surface.

TYPES- ACID LAVA VOLCANO

ACID LAVA

ACID LAVA – is sticky or viscous rich in silica. Due to viscousity they move slowly and quickly solidifies and form a steep cone. It often have violent explosion.

ACID LAVA VOLCANO

TYPES- C0MPOSITE VOLCANO

COMPOSITE VOLCANO

Composite volcano– is steep near the summit, gentle at the base. Usually made up alternating layer of ash and cinder. A cone shaped volcano. Consist of a secondary cone at the side.

The types of volcano features

BASIC LAVA VOLCANO

BASIC LAVA VOLCANO

Basic lava-is a non sticky, more fluid, fluid flow cover large areas, gentle slope because the lava flow very slowly  on the surface.

Vulcanism

Vent – when the magma from the earth’s mantle reaches the surface through.

Lava– when the magma reaches the earth’s surface becoming a lava.

Pipe– a passage way in the volcano where the lava continues to rise through

Crater– an opening where the lava is ejected at the top of volcano.

Caldera– when the explosion of volcano and crater is destroyed.

Crater lake– when caldera is filled up with water.

VOLCANO FEATURES

VOLCANIC ERUPTION

When the volcano erupts, the magma from the earth’s interior is ejected to the surface forming a lava. The lava then ejected up into the air with explosive force. This lava cools and solidifies forming small fragments such as cinder and volcanic ash. Gases such as steam. carbon dioxide and sulphur dioxide are also given off.

Lava flows out, cools and solidifies....

VOLCANO

Definition

an opening in the earth’s crust from which materials such as magma and gases are ejected. The feature of a volcano is refer to mountain.

FAULTING

When enormous stresses build and push large intact rock masses beyond their yield limit, faulting of the surface is likely to occur.  A fault is a fracture along which movement occurs. The plane that extends into the earth and along which slippage occurs is called the fault plane. The fault dip is the angle from horizontal that the fault plane makes. The map direction that the fault takes is called the strike, measured east or west of true north. Generally, two walls are distinguished, the footwall and hanging wall. The hanging wall moves horizontally, vertically, or in both directions relative to the footwall. We identify the hanging and foot walls relative to the fault plane. The hanging wall is above the fault plane while the foot wall is below. The steep face of an exposed block is called the fault scarp. The fault line is the trace of the fault along the surface.

The diagram shows how faulting occurs on the plate movements