When Hitler continued his aggression, Chamberlain pledged Britain to defend Poland's independence if the latter were attacked, an alliance that brought Britain into war when Germany attacked Poland in 1939.
FIND OUT MORE. The Earth is covered in a layer of solid rock called the crust. Rocks are either SEDIMENTARY, IGNEOUS, or METAMORPHIC. Almost all rocks made of minerals, but different rocks contain different mixtures of minerals.Granite, for example, consists of quartz, feldspar, and mica.IND OUT MORE. The Earth is covered in a layer of solid rock called the crust. Rocks are either SEDIMENTARY, IGNEOUS, or METAMORPHIC. Almost all rocks made of minerals, but different rocks contain different mixtures of minerals.
The crust is the outer hard layer of the Earth, and is less than 1% of Earth's volume. The crust is made up of different types of rocks; igneous, metamorphic, and sedimentary rocks.Below the crust is the mantle. The upper part of the mantle is made up of Peridotite, a rock denser than rocks common in the crust.The crust and the upper mantle make up the Lithosphere. The lithosphere is broken up into tectonic plates that can move.he upper part of the mantle is made up of Peridotite, a rock denser than rocks common in the crust. The crust and the upper mantle make up the Lithosphere. The lithosphere is broken up into tectonic plates that can move.