Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

1.The shells make up the diatomaceous earth used in filters

2.It can be used as an ingredient in abrasives

Explanation:

Pinularia, Navicula, Fargilaria are some of the diatoms. These are included in the family Bacillariophyceae. They are unicellular, eukaryotic aquatic both freshwater and marine organisms having extremely beautiful silica shells or frustules.  The diatoms are autotrophic and are a good source of food for marine organisms. Diatoms have very wide fossil record as some rocks are formed of fossil diatoms. They are called diatomite or diatomaceous earth. The deposits of diatoms are mined commercially as abrasives. It is used in filters to remove unwanted material from drinking water.

1.The shells make up the diatomaceous earth used in filters

2.It can be used as an ingredient in abrasives

Explanation: god bless

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.