Earth’s Processes?

Question

i am haveing a hard time anwsering these questions and i hope someone on here can help me

1.Rocks are classified into families based on:

Color
How they were formed
Where they are found
Weight







2.Igneous rocks, like those that have erupted from a volcano, which are found on the surface are called extrusive rocks.

True
false

Answer 1

1. How they were formed.

Sandstones are from lithified sand.
Shale is from lithified clay or mud.
Limestones are mainly from marine organisms, calcium carbonate.

Color and weight (more density and mass than weight) are used to describe the rocks. Where they are found gives us clues as to how they were formed and what environments existed at that time.

2. Magmatic extrusives are outside the earth, lava, volcanic ash, basalt, etc.

Magmatic intrusives are squeezed through other rocks, but do not emerge on the surface, dikes, diabase, gabbro, etc.

Answer 2

1. Different rocks can be the same colour. You can find different rocks in the same places. Weight is dependent on size. You can have two pieces of the same rock that are different sizes and therefore are different weights. So its has to do with how they formed.

2. Intrusive means "inside" Earth. Extrusive means "outside" or on the surface of Earth.

Answer 3

Just to add, the three main rock types are igneous (made from melted rock), sedimentary (made primarily from accumulation of rock particles and minerals), and metamorphic (made by solid-state changes of the first two under elevated pressure and temperature), so the answer to No 1 is "how they were formed".

No 2 is true, as already stated in previous answers.