What is the difference between extrusive and intrusive volcanic landforms?

While I fully agree with Katie's answer, it may be worth addressing the two types of landforms as specifically requested.

Extrusive volcanic landforms are lava flows and volcanic cones as built by the accumulation of ashes, cinders and other pyroclastic products of volcanic explosions. Several lava flows may accumulate on top of one another for hundreds of meters and over huge areas. A good portion of the Indian sub-continent is covered by what are known as the " basaltic traps ". After a few years, the humus generated by these deposits make for very fertile arable land.

Intrusive landforms tend to look like domes or rounded hills. These are the product of the upward push of batholiths, huge masses of molten lava that rise directly from the Mantle yet never actually making it the surface. The landscape is deformed, but the Earth's crust remains unbroken. A second typical intrusive landform is the dyke . These are long and narrow formations that run along buried fault lines. As for the batholiths their origin is from the molten Mantle.

Both landforms are often revealed to the surface by erosion, much later in geological time.