CONNOR: Sedimentary rock is a soft rock type ... Here are some ideas to get you started: The steep cliffs on volcanic rock, like Castle Rock in Edinburgh, were used by castle builders to keep ...

The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion ...

A volcanic eruption in 2910 B.C. may be the ... of the stone plaques were made from black shale — a dark, flaky sedimentary rock found on the island — while others were made from quartz ...

Luckily the answers to such questions are available. Evidence is preserved in ancient volcanic and sedimentary rocks dating back to the Archaean age, between 4 billion and 2.5 billion years ago.

The Earth's surface is constantly reshaped by the movement of tectonic plates, which make up the continental crust on which ...

Relative dating to determine the age of rocks and fossils Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's ...

There are three main rock types: igneous, sedimentary and metamorphic ... Igneous rocks are formed when magma underground or lava from a volcano cools and crystallizes into solid material. These rocks ...