Explanation:

Both the given statements are correct.
On the basis of material ejected, the volcanoes may be classified into four major types: (i)
basalt cones, (ii) bsalt domes or shield, (iii) ash or cinder cones, and (iv) composite or strato
cones.
(i) Basalt cones
Basalt cones are rare. They are likely to be low rather than high cones because of the fluidity
of basaltic lava. The Rangitoo (New Zealand) and Skjaldbreit( Iceland) are the most suitable
examples of basalt cone volcanoes.
(ii) Basalt domes or shield
The Hawaiian volcanoes are the excellent examples of basalt domes or shield volcanoes as
are Mt. Etna and many of the volcanoes of Iceland. Basalt domes are formed where fluid
basaltic lava is extruded. They often attain great heights (e.g., Mauna Loa has an altitude of
4,219 metres).
(iii) Ash or cinder cones
Ash and cinder cones are built where eruptions are of the explosive type with a
predominance of pyroclastic material. Growth of an ash or cinder cone begins around a
crater. The ash and cinder cones seldom attain heights in excess of a few hundred metres
(iv) Composite or strato cones
A strato volcano is characterized by alternating sheet of lava and pyroclastric material. Its
structure attests to alternating periods of explosive and quiet eruptions. Lava intruded into
fissures solidifies to form dykes (dikes), if injected between layers of fragmental ejecta it
forms sills.