This the general term for erupted material of magma which
extruded on to the earth surface
This is the solid and surface portion of the earth. It includes
the crust and part of the upper mantle and is of the order of
100 km in thickness.
Millions of years before the present.
This is an era of geologic time from about 225 to about 65
million years ago.
This is a theory in geology which explains that the lithosphere
is divided into a number of rigid bodies ( plates). These plates
that interact with another at their boundaries, causing seismic
and tectonic activity along these boundaries.
The relative frequency and distribution of earthquakes in a
The structures (for example, bedding, faulting, folding) and
features of the displayed geological units in a region which
have resulted from forces or movements coming from different
The group of mafic and ultramafic igneous rocks. (Mafic: This is
the composition of an igneous rock, which contains
ferromagnesian and dark-coloured minerals. Ultramafic: This is
the composition of an igneous rock, which has been composed
chiefly by mafic minerals).