(Intrusion) You can learn how old the rock layers are around it. the rock layers around under and all around the intrusion are always older than the intrusion itself.
(EXTRUSION) the layers of rock bellow the extrusion is older than the extrusion.
Geologists study where intrusion and extrusion formed in relation to other rock layers. This helps geologists understand the relative ages of the different types of rock! Hope it helps;)😊
I am learning about this in my Science class, and when a geologist looks at an extrusion, they know it's an extrusion because it is Igneous rock, and an extrusion helps tell the reletive ages of the layers around it.
I am learning about this in my Science class, and when a geologist looks at an extrusion, they know it's an extrusion because it is Igneous rock, and an extrusion helps tell the reletive ages of the layers around it.
An intrusion is formed when magma pushes into surrounding rock layers, creating intrusive features like veins or sills, which would be visible beneath the layer of sandstone. In contrast, an extrusion occurs when magma is ejected onto the surface as lava, forming extrusive features like lava flows or volcanic cones above the sandstone layer. The presence of different types of volcanic features would help distinguish between an intrusion and an extrusion in this scenario.
When you look at a rock that has undisturbed layers, the bottom layers are older and the upper layers are younger. Anytime a rock layer crosses another (ie. an intrusion), the crossing layer is younger.
I am learning about this in my Science class, and when a geologist looks at an extrusion, they know it's an extrusion because it is Igneous rock, and an extrusion helps tell the reletive ages of the layers around it.
Geologists can identify extrusion by looking for volcanic features such as lava flows, ash deposits, and volcanic cones. The presence of volcanic rocks, such as basalt or rhyolite, can also indicate past volcanic activity associated with extrusion. Additionally, geologists may identify extrusion sites by studying the topography and landforms created by lava spreading over the surface.
The sandstone layer is older than the basalt. The older rock cannot be on top of the younger rock. The sandstone and the basalt (or basalt dike) are both deposited at the same depth.
Original horizonality
youngest on top
sedimentary rock is a multiple of layers
Undisturbed rock layers can provide valuable information about Earth's history. By studying the order and sequence of rock layers, scientists can determine the relative ages of the rocks and understand the past environments, climate, and geological events that shaped the Earth. Fossils found in these undisturbed layers can also provide insights into past life forms and evolution.