Sandstone
sandstone
the rock used is your mom
Chalk - however, the fossils are microfossils called Coccolithophores. Limestone is a soft sedimentary rock, not exactly "crumbly" like chalk but more likely to contain fossils visible to the naked eye.
building rocker
The 'white Cliffs of Dover" are made of chalk and a little crumbly.
be-case it is a a building
Xwhat rock is used to my building blocks of matter and fertilizers
People have used igneous rock for tools because of its strength and workability; for building materials due to its beauty, strength and availability.
limestone
they used alot of bluestone for mansions in the 1800's, in Sydney were sandstone is prevalent there are sandstone buildings and the Empire Sate Building is made out of Granite, but if one considers concrete a stone or rock then it is.
An argillite is a fine-grained sedimentary rock, sometimes used as a building material.
(Example) The crumbly cookie was delicious.