The powerpoint goes into detail about the different intrusive rock structures and includes an activity for the learners.

1. Intrusive
igneous
activity and
landforms

2. Intrusion
Is molten rock that forms
slowly under Earths surface.
Magma under the surface is
pushed up slowly from deep in
the Earth into any cracks or
spaces.
Sometimes pushes existing
rocks out the way.
Rock cools slowly into solid,
different parts of magma
crystalize into minerals.

3. Occur when magma fails to reach the
surface.
Magma moves from one part of crust
to another.
Features (On the next page) formed
and were exposed after millions of
years of erosion.
Formed from volcanic activity.
Intrusive igneous activity and
associated features

5. 1)
Batholith
Huge dome
shaped mass of
igneous rock
Largest
intrusive rock.
Can occupy an
area as large as
100Km
squared.

6. Laccolith
Formed when magma intrudes into
more or less horizontal
sedimentary strata and strata is
domed upwards in mushroom
shape.

7. Lopolith
s
Magma intrudes sedimentary strata,
underlying rock can’t support weight of
newly formed landform. Floor subsides
resulting in saucer like intrusive forms.

8. Monolith
s
Is a geological feature,
such as mountain.
Consist of single
massive rock.
Erosion exposes
geological features and
is made of hard and solid
metamorphic or igneous
rock.

9. Dyke
Formed where
magma forces
way through
rocks and
solidifies to
form vertical
structure.

10. Sill
Magma intrudes horizontally between rock
layers.

11. What happens when magma reaches the earths surface?

12. Answer
Lava explodes out of volcano, with solid
particles and gas.
3 main types of materials ejected by
volcanoes:
1) Gases
• Nitrogen, Co2, steam and sulfur oxide.
2) Fluid material
• Molten rock and water
3) Solid material
• Ash, pieces of rock and various lava
forms

13. Please
redraw
and label
and
discuss the
intrusive
igneous
rocks.